UN Eye PC Sea Level

Guest Post by Willis Eschenbach

The new UN IPCC Assessment Report 6 (AR6) is out, available here. They make it quite clear that a good chunk of what is in the report is not science. Instead, it is the opinions of scientists. They describe what they are using, for example, as:

… structured expert judgement (i.e., a formal, calibrated method of combining quantified expert
assessments that incorporate all potential processes)

First off, there’s no way to know if they’ve included “all potential processes”. We don’t know that much about the climate, and new discoveries are made monthly. Next, what is a “quantified expert assessment” when it’s at home? A numerical guess that they’ve thought a lot about?

And what is the “formal, calibrated method” for combining a bunch of numerical guesses made by “experts”?

Here’s the description of how they assess the likelihood of something, as well as how much confidence they have in that assessment of the likelihood (emphasis mine).

Throughout this Technical Summary, key assessment findings are reported using the IPCC calibrated uncertainty language (Chapter 1, Box 1.1). Two calibrated approaches are used to communicate the degree of certainty in key findings, which are based on author teams’ evaluations of underlying scientific understanding:

(1) Confidence is a qualitative measure of the validity of a finding, based on the type, amount, quality and consistency of evidence (e.g., data, mechanistic understanding, theory, models, expert judgment) and the degree of agreement; and

(2) Likelihood provides a quantified measure of confidence in a finding expressed probabilistically (e.g., based on statistical analysis of observations or model results, or both, and expert judgement by the author team or from a formal quantitative survey of expert views, or both.

A few notes on this quote. First, “evidence” in their world is not just data, observations, and mechanistic and theoretical understanding. “Evidence”, for them, also includes models and expert judgment. As a man who has programmed computer models of a host of systems, I can assure you that model output is “evidence” only in the very simplest of systems. That’s why Boeing and Airbus use wind tunnels to test physical scale models of proposed airplanes whose design is based on computer model outputs … because model outputs aren’t evidence.

And “expert judgment”, whether it is from one expert or “expert judgment by the author team or from a formal quantitative survey of expert views”, is not evidence in any sense. It’s valuable, to be sure, but a hundred years ago “expert judgment” said malaria was caused by lack of hygiene and fresh air, said ulcers were caused by stress, and said that continental plates couldn’t move … was that “evidence”?

It is hubris of the highest order to think that is not happening now in a variety of fields.

In any case, I thought I’d take a look to see just how good their “expert judgment” might be. I noted that they have a new “Sea Level Projection Tool” to give us their expert judgment on what sea-level rise might be in various areas around the planet.

Figure 1. Screenshot of the UN IPCC Sea Level Projection Tool. For a number of locations (blue dots), it gives both future levels and future rates of rise by decade, starting in the 2020s.

Now, I’ve written about sea level before, including discussing one of the best and longest records in the world. This is the San Francisco record, measured about an hour and a half south of where I write this. Here is that record.

Figure 2. San Francisco sea-level record.

In common with about 80% of the long-term sea-level records, there’s no sign of any acceleration in the rate of sea-level rise in San Francisco, either overall or during the last half-century. The sea-level rise has been stable for a century and a half at 2 mm per year, which is just under 8 inches per century.

So with that as prologue, what would the simplest prognostication be for the future San Francisco sea level rise? Me, I’d say given that there’s been a steady 2 mm rise for 170 years, the first guess would be not much different from 2 mm per year … particularly in the current decade, the 2020s.

And what do the UN IPCC models and the “expert judgment” tell us about the future sea-level rise in San Francisco? It depends on the “Scenario”. The UN IPCC uses five different scenarios. In order of increasing CO2 and other greenhouse gas emissions, and thus in order of increasing theoretical temperature rise, they are called the “1.9”, “2.6”, “4.5”, “7.0”, and “8.5” scenarios. In addition, for sea-level rise there are two “low confidence” scenarios. They say:

Two low-confidence scenarios, indicating the potential effect of low-likelihood, high-impact ice sheet processes that cannot be ruled out, are also provided. … Global mean sea level rise above the likely range – approaching 2 m by 2100 and 5 m by 2150 under a very high GHG emissions scenario (SSP5-8.5) (low confidence) – cannot be ruled out due to deep uncertainty in ice sheet processes.

With that as prologue, here are their median (50% quantile) projections of the rate of rise of future San Francisco sea levels, by decade, for those seven different scenarios.

Figure 3. UN IPCC projected rates of sea-level rise by decade. These are the median values.

(Let me note that this reveals one of the huge benefits of this kind of analysis for their “experts”—almost regardless of what the sea level does in the future, they can truthfully say “See, we projected that!”. But I digress …)

However, there’s a deeper and much more serious problem. To highlight it, here are the four least extreme scenarios, 1.9 through 7.0.

Figure 4. Same as in Figure 3, but for the four least extreme scenarios. Again, these are the median values.

I’m sure that you can see the problem. In their “expert judgment” of the model results, the median result (50% quantile) of the models for San Francisco sea-level rise for the current decade is 4 mm per year … say what? It’s been half of that for 170 years, and it’s suddenly gonna double this decade?

Now, at present we’re 2 years into the decade of the 2020s … so for the entire decade to average 4 mm per year, the rate would have to start accelerating today and continue accelerating to the point where it would hit about 7.5 mm per year by 2029. Only then would the decade average 4 mm per year.

It gets worse. The high estimates of sea-level rise (the 95% quantile) give San Francisco rates of rise ranging from 6.4 to 11.6 mm per year … for the current decade.

Sorry, but this is not science in any form. This is a joke. There’s no way on this earth that during the 2020s the average San Francisco sea level rise will average either 4 mm per year or 8 mm per year.

Bear in mind that this is the result of “a formal, calibrated method of combining quantified expert assessments that incorporate all potential processes”. Doesn’t that make you feel all warm and fuzzy about the rest of the UN IPCC AR6 claims?

So remember this monumental sea-level rise madness whenever someone points out that “the IPCC says” something about the future … their “expert judgement by the author team or from a formal quantitative survey of expert views” may not be worth a bucket of warm spit.

My very best to everyone—even in these parlous, fractious times, life is good.


My Invariable Request: When you comment, please quote the exact words you are referring to. It avoids endless misunderstandings.

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Tom Halla
August 11, 2021 10:10 am

Their estimates of sea level rise are something between WAG and pure POOMA.

John Endicott
Reply to  Tom Halla
August 11, 2021 10:17 am

Yes but they have a formal, calibrated method of combining those WAGs and POOMAs  that incorporate all potential processes, so it’s all good 😉

Last edited 1 month ago by John Endicott
On the outer Barcoo
Reply to  John Endicott
August 11, 2021 10:28 am

PMOL to the IPCC … “as in pull my other leg”

Bryan A
Reply to  On the outer Barcoo
August 11, 2021 3:27 pm

Channeling JFK…(moon speech)
“We institutionalize science for
the sake of the Climate Change steamroller
in this Decade and do the other things,
not because they are truthful
but because they are scary
And will motivate people to give up
both their rights and freedoms
and make them want to give US Absolute Power”

Last edited 1 month ago by Bryan A
Rick C
Reply to  John Endicott
August 11, 2021 1:51 pm

To the best of my knowledge, there is no scientific field that would ever consider using this process of expert guessing to settle an actual science issue. DEFUND THE IPCC now.

Reply to  Rick C
August 11, 2021 5:11 pm

We have just seen this same scenario play out with COVID and the NIH in the US. The experts have been guessing for 18 months now, and they are still either wrong or unsure.

bill Johnston
Reply to  John Endicott
August 11, 2021 5:30 pm

“calibrated”. IOW, it measures up to what we decided was the required outcome.

Peter Gardner
Reply to  John Endicott
August 13, 2021 1:38 am

I don’t know what WAGs and POOMAs are but I do know that four Claratyne tablets are a good initial dose derived from structurally expert judgment of a calibrated method of observing and analysing empirical evidence on how to stop diarrhoea, otherwise known as putting a cork in it.

Last edited 1 month ago by Peter Gardner
Reply to  Tom Halla
August 11, 2021 11:13 am

There could be a never before seen major solar flare that melts Antarctica. Who knows what such people dream about at night?

Harry Passfield
Reply to  AndyHce
August 11, 2021 1:19 pm

Then they should keep their hands over the duvet!

Bryan A
Reply to  AndyHce
August 11, 2021 3:38 pm

And that would be from a never before experienced therefore unprecedented, BUT WELL MODELED, feedback loop caused by an interaction between INCREASING CO2 and the increased Polar Auroras activity caused by a more energetic sun…
Wink wink

Reply to  AndyHce
August 11, 2021 10:39 pm

The 62Mt rock that is heading toward Earth at 30km/s only needs a slight nudge to shift the trajectory directly toward Earth. It is so close that it will pass between Earth and moon and through the path of some of the higher orbit satellites.

If it hit Earth, I predict humans would then know what climate change looks like.

Reply to  RickWill
August 12, 2021 12:13 pm

About 1/2 the weight of a loaded logging truck. With a good load bonus these are often seen approaching 30 km/s.

Reply to  Tom Halla
August 11, 2021 11:30 am

The Figure 3 clearly shows a total disconnect from reality.

Reply to  Tom Halla
August 11, 2021 11:41 am

You forgot the SOMP

mark from the midwest
Reply to  Tom Halla
August 11, 2021 1:56 pm

But isn’t there a structural issue in estimating covariance between WAG and POOMA, and wouldn’t they need to be constantly re-calibrated to the sensitivity of the re-cal-ibrator via the means of advance multi-variate occular re-regression? I think we need to convene a committee to commission a study on the need to reconfirm this.

Nick Schroeder
August 11, 2021 10:12 am

The format appears entirely different from AR5.
No way to compare the two, what changed, what got dropped, what was quietly swept under the rug.
Where is AR6’s version of AR5’s TS 6 Key Uncertainties?
Did they resolve the huge unknowns in TS 6?
Bait & switch, used car salesman hocus pocus.
Not that it matters.
See previous comments.

Reply to  Nick Schroeder
August 11, 2021 1:03 pm

They are not even pretending any more. They’ve gone full moron.

The 8.6 forecast is fun, it is put there especially for the Guardian so they can headline :
IPCC report shows sea level rise may be as much as one foot per decade by 2150 !!

Last edited 1 month ago by Greg
Reply to  Greg
August 11, 2021 1:31 pm

I’ll wait and see.

Reply to  Greg
August 11, 2021 10:32 pm

You know what, even at luney crazy level of a foot per decade, there’s plenty of time to build dikes around the vulnerable stuff and other mitigation strategies, that will be cheaper, less disruptive and more reliable than all the insanity recommended by the Church of Greta.

That why the whole issue just leaves me shaking my head. Back in the 90s, one could have stimulating discussions of nuclear power, solar power satellites, ocean fertilization, vast areas of the Arctic blooming. But now it’s just a suicide cult that demands blood now to stop a sci-fi future pulled out of L. Ron Hubbard ass, that has mesmerized the ambulance chasing media with the doomsday stupidity.

Really, science, business and the political class are totally off the rails. King Louis and Marie Antoinette where genuises compared to the whole brain trust running the world now.

With the exception of the Chinese and Russians, at least they act like they know the climate is fairly stable, and are smart enough to take advantage of climate-stupid politicians.

Jay Ayer
August 11, 2021 10:16 am

Take a look at NOAA’s Boston Harbor tide gauge. From 1920 to 2020 the sea rose 2.87 mm / year with no increase in the rate of rise. The graph is a straight line for 100 years.

Joao Martins
Reply to  Willis Eschenbach
August 11, 2021 10:37 am

Please, do!

There is a lot of confusion in the use of the terms, “speed”, “rise”, “accelerated” (very common in mainstream media, when they simply mean an increase or a fast increase, irrespective of its being steady or accelerated). Not to mention the confusion of sea level rise with subsidence.

Alastair Brickell
Reply to  Willis Eschenbach
August 11, 2021 1:43 pm

Yes Willis, a post on the ‘no acceleration’ issue would be very useful if you have the time/inclination. Especially so if you could update and expand on your previous posts on the satellite record vs. tide gauge issue, just how reliable GIA is, etc.

spangled drongo
Reply to  Willis Eschenbach
August 11, 2021 5:05 pm

Not only no acceleration, Willis, but on our side of the Pacific [Aust] the old sea wall that I helped build in 1946 which the [normal BP] king tides used to often just cover and trickle into our well if we didn’t keep a levy around it, nowadays are up to a foot LOWER and never higher.

Marty Cornell
Reply to  Willis Eschenbach
August 11, 2021 8:01 pm

Tom Wysmuller already did.

Alastair Brickell
Reply to  Marty Cornell
August 11, 2021 8:31 pm

Sadly Tom Wysmuller passed away a few weeks ago. Another great skeptical figure gone…

I had the pleasure of attending one of his talks at the Porto Conference a few years ago and he gave a very good and memorable presentation.

Reply to  Willis Eschenbach
August 12, 2021 6:04 pm

Please write it in a manner that will be understood and accepted by some of these warmish people. They don’t get the scientific reason why 4, 8 or 30mm/year sealevel rise is so difficult to achieve.

4 Eyes
Reply to  Jay Ayer
August 11, 2021 3:40 pm

Take a random look at the PSMSL viewer. There are lots – lots – of places with trivial sea level rise and few with any rise above 3 mm/yr

John MacDonald
August 11, 2021 10:17 am

Willis, thanks for catching this “anomaly” by the geniuses in IPCC. If only the science writers at NPR, Gaurdian, BBC, NYT, etc were able to analyze and think as clearly. AR6 will be touted as the be-all and end-all report while pulling more wool over the eyes of the sheep.

Richard Page
Reply to  John MacDonald
August 11, 2021 2:23 pm

Some of the useful idiots are in on the scam but most are terrified little lambs that have been convinced that the sky will, indeed, fall on their heads. They will realise in time that they have been scammed then they’ll get very angry.

Robert Hanson
Reply to  Richard Page
August 11, 2021 3:12 pm

Sad to say it, but I’m not holding my breath for that. This scam has been going on for many decades, with the clamor getting louder and louder, and yet I see no evidence of the “terrified little lambs” even beginning to question it.

Reply to  Richard Page
August 11, 2021 3:41 pm

Regrettably, Richard, it takes a very long time to reach the point where enough people are angry. The first few get demonised (jailed if possible) so that the next few decide not to show their heads above the parapet (sorry about the mixed metaphor) and then the next few after that can see no-one objecting so maybe their own thoughts are wrong, etc, etc. And all the time the media will be pumping out the propaganda. Only with a free press is it impossible to fool everyone all the time.

bill Johnston
Reply to  Mike Jonas
August 11, 2021 5:43 pm

Ah yes. Yearning for a free press. The good ol’ days. I remember.

John Swallow
Reply to  Richard Page
August 12, 2021 1:08 am

Try to post something to https://www.realclimate.org/index.php/archives/2021/08/a-tale-of-two-hockey-sticks/?unapproved=794432&moderation-hash=13ffeaa54a7739a2d3503200ee5a0101#comment-794432 and see that the truth will never see the light of day on this public funded web site that this clown, Gavin Schmid, runs and see when the anger factor kicks in.
RealClimate, funded by unwilling taxpayers and run during work hours by Gavin Schmidt, Michael Mann, William Connolley, etc., and funded by George Soros through Fenton Communications. Climateprogress, funded by George Soros’ string puppet Joe Romm, etc. And the new “Climategate Chairman,” funded by the heavily pro-AGW Grantham Foundation…
WattsUpWithThat, funded by a few dollars a day in ad revenue, and mostly by voluntary reader contributions.
Question: Which ones are “well funded and well organized,” and which one is actually serving the general public interest?
Only a few real scientists, including disgraced Dr. James Hansen and corrupt Dr. Mario Molina, support climate alarmism. The rest are serial perjurer Michael Mann and countless practitioners of environmental studies and climate change science.
Climate alarmism is a huge fraud that is riding a gravy train of enormous size. The climate change industry alone boasts an annual revenue of $1.5T (yes, $1.5 trillions). It’s likely an exaggeration but there are still hundreds of billions of dollars of taxpayers money that are spent on climate alarmism promotion – the largest PR operation in history.

Jim Steele
August 11, 2021 10:18 am

Did thee IPCC experts include the evidence, as from the Pacific Islands, where they subtracted subsidence from relative sea rise? I suspect not

As discussed here https://perhapsallnatural.blogspot.com/2021/07/islands-of-truth-emerging-from-murky.html

Research shows “after subtracting subsidence effects from the +1.3 mm/year average relative sea level rise, the average absolute rate of rise computed to an astonishingly low +0.125 mm/year; with no signs of acceleration or evidence of thermal expansion”

Last edited 1 month ago by Jim Steele
Jim Steele
Reply to  Jim Steele
August 11, 2021 10:24 am

Here is the data

LTT Ocean sea level_Boretti_2020.png
Clyde Spencer
Reply to  Jim Steele
August 11, 2021 10:35 am

Jim, what do the V, W, and U correspond to?

John Tillman
Reply to  Clyde Spencer
August 11, 2021 11:22 am

Table 1 and Figure 9 present a summary of the tide gauge and GPS results for the LTT stations of Oceania. v is the relative rate of rise of the sea level, a the acceleration of the sea level, w the absolute vertical velocity of the tide gauge, u the absolute rate of rise of the sea level. The table also proposes as w the GIA vertical velocities VM2 from [424].


Mike Lowe
Reply to  John Tillman
August 11, 2021 1:39 pm

Now, can I guess what similarity there is between the geology of Honolulu and Auckland?

M Courtney
Reply to  Clyde Spencer
August 11, 2021 11:37 am

If Jim will excuse my butting in, they are rates of sea level rise.

It seems to come from this paper.
Relative sea-level rise and land subsidence in Oceania from tide gauge and satellite GPS (degruyter.com)
Which says:

2 Method

Two regressions are usually applied to the time series of the measured MSL to compute the relative sea-level rate of rise and acceleration. A linear regression:

y(x)=A+v⋅x (1)

returns the sea level rate of rise v as the slope.

A quadratic regression:

y(x)=A′+B′⋅x+⋅a⋅xx (2)

returns the acceleration a as twice the second-order coefficient.

Linear regression is also applied to the time series of the absolute vertical position of a GPS antenna located near the tide gauge installations to compute the absolute velocity w as the slope:


The absolute rate of rise of the sea level u is then computed [9] as their sum:


Steve Z
Reply to  M Courtney
August 11, 2021 12:24 pm

In the above regressions, if y represents sea level relative to a fixed datum, and x represents time, then in a linear regression, v in equation 1 represents the velocity of sea level rise.

In equation 3, what is the “absolute vertical position” of a GPS antenna? Relative to what datum? A satellite, whose orbital radius can change much faster than sea level? Why would the “absolute vertical position” of a GPS antenna vary with time?

If a quadratic regression such as equation 2 results in a better fit (r^2 value closer to 1.0) than a linear regression, then the “a” term (coefficient of x^2) would represent an acceleration in mm/yr^2. But for a regression over a very long period of time (which tends to smooth out short-term variations) the “a” (or acceleration) term should be close to zero. Only if the people doing the regression cherry-pick a short time frame where sea-level rise was slower near the beginning and faster near the end can a value of “a” be calculated that is significantly greater than zero.

If a non-zero acceleration is regressed from equation 2, then the instantaneous rate of sea level rise at time x is the derivative of equation 2, or dy/dx = B’ + 2ax.

Reply to  M Courtney
August 11, 2021 1:10 pm

returns the acceleration a as twice the second-order coefficient.


M Courtney
Reply to  Greg
August 11, 2021 2:18 pm

I just quoted the linked paper to answer the nomenclature question.
Not my work.

Reply to  Jim Steele
August 12, 2021 10:43 pm

And add the fact that many Pacific islands have been growing, especially the ones most crying for climate cash.

August 11, 2021 10:18 am

These are the sorts of analyses one uses when the data does not support the claims one wishes to make.

Jim Steele
August 11, 2021 10:22 am

Regards SF and the whole west coast, satellite data shows sea level fell from 1990s to 2014

sea level trend_NOAA_2012.png
Frank from NoVA
Reply to  Jim Steele
August 11, 2021 10:56 am

Interesting graphic. Can the Jason folks explain how the water level at one end of a ‘bathtub’ can fall while the other end rises? (I understand there are transient effects in any system, but aren’t we looking at about a decade here)?

Reply to  Frank from NoVA
August 11, 2021 12:41 pm

El Nino & La Nina. Looks like most years the easterlies push all that water west towards Asia. It sloshes back on during El Ninos

Bryan A
Reply to  Eisenhower
August 11, 2021 3:46 pm

Also the earth is rotating at 1000mph from the west toward the east this should also act to relocate some mass westward

Reply to  Bryan A
August 11, 2021 4:34 pm

If the rotation were accelerating, it would, but it isn’t. It’s slowly decelerating over a geologic timescale.

It’s just prevailing winds. Same as a wind-driven storm surge does, raises sea level faster than the water returns the other way.

Last edited 1 month ago by WXcycles
Reply to  Frank from NoVA
August 11, 2021 12:58 pm

La Niña. Trade winds stack up water in the west pacific so the sea level there can be quite a bit higher than in the east (west coast of the Americas).

Bryan A
Reply to  Thomas
August 11, 2021 3:48 pm

You see a similar affect in the Atlantic

Reply to  Frank from NoVA
August 11, 2021 1:24 pm

If the water is warmer at one end of the bathtub, it is less dense, so the equilibrium level is not flat as we had the habit of thinking. The easterly trade winds ( blowing westwards ) in the tropical Pacific, push warm surface water westwards.

The less dense water of the west Pacific warm pool depresses the cold deep water and floats higher, forming a “lens” of warm water.

My interpretation of Jim’s map is that it must have spanned a period ending in La Nina conditions before this warm water flows back across the equator forming an El Nino event.

The dates of the period should have been included in the graphic since this is not long enough represent any kind of long term average.

Mike Lowe
Reply to  Greg
August 11, 2021 1:43 pm

You mean, like the typical newspaper heading “worst / highest / deepest ever? Calculated over a WHOLE human lifetime!

Peter D
Reply to  Jim Steele
August 11, 2021 4:15 pm

Interesting graphic, I live on the north east coast of Australia. I used to live in PNG years ago. A few years ago, two centuries of tectonic shift caused a problem with navigation charts. The entire plate is moving north fast (in geological terms) causing uplift. Where I live, sealevel is falling. North of here, it increasingly exposes coral reefs at low tide (which ‘experts’ say is due to climate change). Go to the coast to the west of Finschafen in PNG, and you can see evidence in the shoreline benches, like a series of 100 meter limestone steps. I can’t find a photo anywhere, spectacular but off the beaten track.

Just don’t trust the Australian data from our marine science people.

Reply to  Jim Steele
August 11, 2021 4:30 pm

The time period is interesting. It spans from before the 97-98 monster El Nino to just before the 15-16 version. What that suggests to me is that the warm water piles up in the warm pool until a “tipping point” happens – maybe a short interruption in the easterlies that triggers the slosh. We should be able to use this data with different time intervals to track the buildup and perhaps come to a better estimation of when the next El Nino is likely.

August 11, 2021 10:23 am

Great points as always. Nearest I can figure the majority of sea level rise occurs if the oceans warm and expand or more ice melts than freezes every year.

I guess there is some star water that may be dropping in from outside our atmosphere and burning of hydrocarbons will contribute, although they are also being formed so I’m not sure what the net-net is. Additionally we get transpiration from plants but again they also absorb water so who knows about this one. Plus we have tectonics move the basin bottoms up and down but these are generally over long time periods.

Looking at warming oceans and ice melting, it seems we aren’t going through any acceleration since neither are happening at a faster clip and they both may actually be going the other way. Antarctica is brutally cold this SH winter and Greenland’s melt season this year is pretty much a bust. Already temps above 60N are falling and the first forecast I’ve seen for December is it is going to be a cold one to remember in the US east of the Mississippi.

I’m glad for President Obama and Al Gore not having to worry about their beach houses going under, regardless of all the expert judgement calls on what is to come soon.

Adam Gallon
Reply to  rbabcock
August 11, 2021 1:12 pm

You can also add “fossil water”, pumped up from aquifers.

Reply to  rbabcock
August 11, 2021 1:26 pm

That would be cool, how about Willis does the same thing for Martha’s Graveyard ?

Ian Magness
August 11, 2021 10:24 am

Brilliant evisceration Willis.

August 11, 2021 10:25 am

Somehow I don’t think the market for seaside villas even flinched, unless politicos are piling in more than before the scare campaign. Also, the market for whole-island retreats of billionaires has not changed.

August 11, 2021 10:27 am

This is the scientific method…of diplomats with spin consultants.

Reply to  ResourceGuy
August 11, 2021 12:43 pm

They appointed themselves the sole experts in an uncertain field of science, then gave us their opinions, then gave us their opinions about how accurate their opinions are.

August 11, 2021 10:27 am

Obfuscation is the goal of these reports.

Clyde Spencer
August 11, 2021 10:28 am

… almost regardless of what the sea level does in the future, they can truthfully say “See, we projected that!”.

Heads I win, tails you lose!

Ron Long
August 11, 2021 10:33 am

Good job tearing into these science pretenders, Willis. The internet is filled with experts opinion, some of it obviously paid for, and a medium-skilled person searching for an answer is not commonly able to sort out the science from the scientist’s opinion. Now Oregon (Kalifornia soon to follow?) has made the 3 R’s irrevelent to a High School Diploma, in the interest of eliminating racism. Cultural regression is upon us.

August 11, 2021 10:34 am

I’ve been looking for people to bet money with about the ridiculous sea level rise predictions in the next five or ten years since its easy to verify . should be easy money .no takers yet .

Last edited 1 month ago by garboard
Reply to  garboard
August 11, 2021 1:34 pm

Anyone willing to bet would be a hard core liberal, so cannot be trusted to pay up anyway.

They will either find a suitably rigged satellite record saying it rose; claim your “science” was a product of white cisgender patriachy and thus not valid; or say they have a 1/32 ancestor who was a slave and you own them ten times the wager in “reparations”.

That’s without even trying to imagine the kind of insane BS they will have invented in the meantime.

Reply to  garboard
August 11, 2021 3:15 pm

same. I started with the brilliant scientists and their cohorts at realclimate back in 2008. could never get any takers at 50% of the model projections. Guess they are smart enough not to believe their own propaganda

August 11, 2021 10:38 am

Predicting sea level rise (and any acceleration) for any given location is a mugs game due to several natural Earth forces at work, including a 18.6 year tidal cycle caused by our Moon. Not to mention any subsidence, uplift, long term prevailing winds, the planetary Geoid itself and a host of other natural causes such as ocean currents causing local oceanic cooling and warming in longer term cycles.

For the IPPC to try and boil it all down similar to water in a bathtub is foolish, but their goal is promoting some mythical climate emergency, not any actual science. And if they are trying to use sea level rise for a climate emergency, well that is going to take dozens of years to even establish any trend and then that will still only be local. We are in a very stable state of sea level rise comparative to long term history, which the best science as presently established is an average of 2 mm a year. Even if it were to get to 3 mm a year, still not any concern for the next couple of decades, if this century.

This would be the weakest ‘evidence’ of all regarding any climate emergency. And the easiest to disprove to those that might be taken in by such opinionated science, which should be evident to anyone willing to learn.

AGW is Not Science
Reply to  Earthling2
August 11, 2021 12:19 pm

their [IPCC’s] goal is promoting some mythical climate emergency, not any actual science

And there you have summarized it quite nicely.

And since any sea level “trend” was well established before any meaningful human CO2 emissions, clearly it won’t be changed by trying to “manage” human CO2 emissions.

Reply to  AGW is Not Science
August 11, 2021 1:39 pm

Yes, that is probably the most important point to be seen from this.

The 2mm a year is not CO2 because IPCC says that was only a significant player after 1960. So the “man made” effect here is difference between early 20th c. and later 20th c.

ie ZERO. That is the effect we are trying to “fix”.

Rud Istvan
August 11, 2021 10:44 am

Nicely done, Willis.
In the SPM they manufactured global SLR acceleration by splicing the faulty satalt (doesn’t close) onto tide gauges (which do close) at a global dGPS vertical land motion corrected 2.2mm/year, about like SF. A version of Mann’s hide the decline trick.

Reply to  Rud Istvan
August 11, 2021 1:40 pm

Thanks Rud, could you explain “doesn’t close”?

Laws of Nature
August 11, 2021 10:58 am

Dear Willis,

“It gets worse. The high estimates of sea-level rise (the 95% quantile) give San Francisco rates of rise ranging from 6.4 to 11.6 mm per year … for the current decade.”

Nice find and exactly what needs to be done! I saw postings that this report is political, of course it is, why posting it? What is needed is an analysis like this one, why the reported scenarios contradict established science and in this case common sense!

I believe there are statements about the temperature development till 2030 as well, which would need an average five-fold warming rate or an order of magnitude higher warming rate by 2030 then now, without giving any hint about which real world parameter could possibly responsible for a change like that!


H. D. Hoese
August 11, 2021 11:05 am

“….IPCC calibrated uncertainty language …”  Calibrate, I like definition number 4–“to adjust precisely for a particular function. ”   Wonder what their ‘function’ was?

My (well don’t own it yet) sea level just went down like it was supposed to this time of year, again not covering the road as predicted two decades+ ago.

Reply to  H. D. Hoese
August 11, 2021 11:23 am

Nice to know that the IPCC has formally adopted the confidence level method used for the “97% of scientists”, https://wattsupwiththat.com/2017/11/10/freeman-dyson-on-heretical-thoughts-about-global-warmimg/#comment-2205470.
That famous figure 97% comes from 75 scientists out of a carefully selected sample of 77 scientists from the originally polled 3,146 scientists.

Don’t bother with “sigmas” when estimating probability. Sigmas are racist anyway.

AGW is Not Science
Reply to  Curious George
August 11, 2021 12:28 pm

Now for something really funny – do the math:

Their 97% consensus was contrived by ignoring…wait for it…97% of the responses! LLLMMMFFFAAAOOO 😀 😀 😀

H. D. Hoese
Reply to  AGW is Not Science
August 11, 2021 2:13 pm

I was looking at the report and found this, not sure I can do this but—
“Final Government Distribution…Do Not Cite, Quote or Distribute ”

Alan the Brit
Reply to  Curious George
August 12, 2021 12:56 am

Interesting! I thought that it was only 75 “scientists” out of 77(who bothered to respond to the survey) that said they believed mankind was causing climate change!!! Total number approached was around 10,000 via online!!! Either way, it’s simply an exercise in playing with numbers to produce that desired outcome, just like those Lara-Croft X-Box 360 computer models the IPCC are so fond of!!!

Alan the Brit
Reply to  H. D. Hoese
August 12, 2021 12:49 am

I live down by the sea in the South-West of England, & sea-level rise is horrendous, several feet each day twice a day!!! Of course it falls twice a day every day…..I think!!! I live in a two-storey apartment staring at first-floor level, so if the sea-level rises 15-16 feet then I might be in trouble, but sea-fishing would be a doddle!!! ;-))

Dave Andrews
Reply to  Alan the Brit
August 12, 2021 7:38 am

In the Mersey estuary between the Wirral and Liverpool sea level can vary by as much as 9 metres on many days!

AGW is Not Science
Reply to  Alan the Brit
August 12, 2021 9:15 am

When looking for a meaningful analogy for the “climate crisis” bullshit, I compare it with measuring the rate of rise of the water as the tide comes in and extrapolating that trend as if it will continue indefinitely.

The difference being that people have enough information over a sufficient period of time to understand that the water will not continue to rise at the same rate ad infinitum. With long term temperature changes, their entire lifetime is insufficient to notice the ebbs and flows, and therefore it is easy to prey on their fear of the unknown, the “climate crisis” being the pseudo-“science” version of “witches.”

August 11, 2021 11:11 am

Great post but unfortunately the only thing some will remember is the “code red” headlines blasted all over the MSM the last few days.

Richard Page
Reply to  Kevin
August 11, 2021 2:27 pm

Greens have gone red. Can’t say I’m the slightest bit surprised.

Alan the Brit
Reply to  Richard Page
August 12, 2021 12:57 am

They always were, only now they’re not too bothered in hiding it!!!

Reply to  Kevin
August 11, 2021 3:03 pm

I don’t think most people will pay any attention to ‘Code Red.’

It’s not a reference to anything climate, like good ol’ Climate Change or Global Warming. There’s some imagery with those terms. Code Red conjures up images of….

… wait. Wasn’t there a version of Mountain Dew branded Code Red? I think it was an extra-caffeine fruit punch flavored Mountain Dew (a Pepsi product).

My guess is that a lot of people in the U.S. will think Mountain Dew from all the Code Red advertising that was pushed out.

August 11, 2021 11:12 am

I just went through two scenarios. Rincon west of Los Angeles and Battery at the tip of NYC. Both of them from lowest to highest all show small rises 2020-2030 with error bars that absolutely encompass all possibilities. My conclusion is that the construction of these forecasts are tailored make sure no career is likely to face the consequences of their bad tarot card readings.

Gary Pearse
August 11, 2021 11:21 am

Willis, your analysis shows the ‘Team’ doesn’t work out the logic of their pronouncements.

In the article before this one in which prof Varenholt (Die Kalte Sonne), criticizes AR6, I argue the applicability of Le Châtelier’s principle for
multiple interactive compo systems.

My example is the the 30yr projections of temperature with only changes in CO2 content of the atmosphere. Observations showed estimated temperature change to be 300% too high.

Assuming the underlying “physics” to be ‘correct’ (big assumption!), the Le Châtelier coefficient to be applied to IPCC projections should be 0.33 and this should be incorporated into their models. Perhaps the IPCC experts should be considered another component added to the system!!

Their 6.4 mm-11,6 mm/yr (x 0.33), becomes 2.1mm -3.8mm. We can live with that.

Bruce Cobb
August 11, 2021 11:27 am

If they’re not lyin’ they’re not tryin’. Speaking of which, anyone else notice that this year’s Climate Liarpalooza starts on Halloween? You just can’t make this up. They’ll be there, pretending to be scientists and saviors of the planet, with the ultimate goal of scaring the bejeebers out of everyone, in hopes of grabbing all the climate candy -money, power, fame, etc.

Zig Zag Wanderer
Reply to  Bruce Cobb
August 11, 2021 2:56 pm

Ha ha!

A terrific opportunity for the likes of Josh to parody that! All those climate worriers going door to door looking for all the ‘Climate Reparations’ they are owed.

Last edited 1 month ago by Zig Zag Wanderer
August 11, 2021 11:29 am

The Battery in New York City has SF beat. It goes back to the time of Lincoln, like SF but the increase has been about a linear 2.8 mm/year of which most is land settlement.

Reply to  DHR
August 11, 2021 1:42 pm

It’s called having a flat battery.

Abolition Man
August 11, 2021 11:31 am

“…may not be worth a bucket of warm spit.”
I would like to point out that you have fallen into the word salad trap of the alarmists by using the word ‘may!’ It is either worth that much or not, and from reading the rest of your analysis; I think it is safe to say that it approximates the value of a week-old bucket of spit or even the dreaded pi$$ bucket! I am truly shocked, as you are usually so precise!

Reply to  Abolition Man
August 11, 2021 1:43 pm

I prefer the Aussie expression : not worth a crock of shit.

Reply to  Greg
August 11, 2021 5:55 pm

“What a crock!”, was an American expression which came to Australia from Hollywood movies during the late 1970’s. We kids wondered what it meant, thinking it meant ‘croc’, as in, “What a crocodile”. … eh? Hence our consternation. Imported US 1980’s TV programs then progressed that to, “That’s a crock of shit!”, and we realized it’s not a reference to crocodiles, probably a reference to US ‘bed-pan’ crockery.

Australians used blunter terms like, “What a load of shit!”, referring to cart-loads of steaming horse manure collected on cold mornings from local thoroughfares via horse ‘n cart teams with shovels. My second job as a boy was to collect such from a local race-course stables and mix it with soil for use on gardens. It creates heat as it decays to compost. So this had the fruity variation; “What a steaming load of horse shit!” Which variant was traditionally reserved for use only in political or religious discussion. If you said, “What a crock!” to an Australian in 1970, they would have had no idea what it meant.

Last edited 1 month ago by WXcycles
Abolition Man
Reply to  Willis Eschenbach
August 11, 2021 3:20 pm

The odds of someone from the IPCC actually speaking some scientific truth is as remote as the moons of Neptune, and probably as easy reach!
I feel safe in my claim because speaking truth for them is likely to cause their head to explode! Either way it’s a win-win for us old climate realists!

Smart Rock
August 11, 2021 11:37 am

Exactly. What someone thinks is not evidence of anything. Most especially when getting paid (or at a minimum, getting re-hired for the AR7 junket) is dependent on having the “correct” opinions.

Corruption of science by money, career-advancement considerations and/or fear of exclusion from a favoured group is rampant in climate science. And the pharmaceutical industry is not that different.

Tom Abbott
Reply to  Smart Rock
August 11, 2021 5:54 pm

“What someone thinks is not evidence of anything.”

That’s right. Opinions are not good enough.

August 11, 2021 11:50 am

Yea I’ve seen this term “structured expert judgement” and it’s insidious, it threatens to undermine 500 years of the enlightenment (the real one) and the scientific method of Galileo, Vesalius and Newton.

Extravagant words? The whole point of the scientific method was to move to observation and deduction as a way of learning about nature. As an alternative to what? To structured expert judgement. Influential thinkers would sit and think about stuff, with minimal anecdotal observations and pronounce how the world was, that it was flat and fire came from phlogiston and that dirty blankets created mice, etc.

Observation based science had to fight hard to overcome “structured expert judgement”. Now it looks like it will have to fight the same fight again.

Steve Z
August 11, 2021 12:01 pm

Figure 2 shows that “there is no statistically significant acceleration” of sea-level rise over the past 170 years, but the IPCC believes there will be a huge acceleration over the next decade.

Isaac Newton told us that an acceleration must be due to an unbalanced force. What is the “force” that will cause the IPCC’s predicted acceleration in sea level rise? If they believe it to be the rise in CO2 levels in the atmosphere, why didn’t it cause an acceleration during previous decades?

Peter W
Reply to  Steve Z
August 11, 2021 12:35 pm

You have to take into account their forecast of dramatic temperature increase. That makes the air above the water expand, and therefore grow lighter in weight. With less weight pressing down of the water it rises up. (Their logic, not mine!)

Tom Abbott
Reply to  Steve Z
August 11, 2021 6:01 pm

The acceleration of sea level rise is supposed to occur because CO2 will supposedly raise atmospheric temperatures, which will warm the oceans, and will cause the oceans to expand, and increased amounts of ice will melt from the warmer weather, which will add to the increased sea level.

Unfortunately, for the alarmists, we have a 170 year record of no sea level acceleration even though CO2 has been rising all during that time. So it would seem CO2 is having no effect on sea level rise acceleration since there is no sea level acceleration.

Last edited 1 month ago by Tom Abbott
AGW is Not Science
August 11, 2021 12:09 pm

Bear in mind that this is the result of “a formal, calibrated method of combining quantified expert assessments that incorporate all potential processes”. Doesn’t that make you feel all warm and fuzzy about the rest of the UN IPCC AR6 claims?

So remember this monumental sea-level rise madness whenever someone points out that “the IPCC says” something about the future … their “expert judgement by the author team or from a formal quantitative survey of expert views” may not be worth a bucket of warm spit.

LMAO. But “MAY” not be worth a bucket of warm spit?! Way too generous there! 😀

Reminds me, once again, of that transmission shop commercial on tv where the man behind the counter assures the customer “Our mechanics are experts!” while a bunch of chimpanzees beat on transmissions with sticks behind him.

I think of the IPCC as the chimps and the Eco-Fascist types in government as the guy behind the counter telling us to place our faith in the “expertise” of the chimps.

Rich Davis
Reply to  Willis Eschenbach
August 11, 2021 4:11 pm

But surely from the sample we have to analyze we can safely say that at least 50% of what the IPCC says is not worth a bucket of warm yellow liquid?

AGW is Not Science
Reply to  Rich Davis
August 12, 2021 9:26 am

I think it’s safe to say anything the IPCC says that is true is buried in the full “report” that will never be read by the “media” or the target politicians.

As for the “Summary for Policymakers,” I’d say the figure is damn near 100%, and anything “true” will be parsed in such a way as to substantially degrade its significance.

AGW is Not Science
Reply to  Willis Eschenbach
August 12, 2021 9:23 am


But you didn’t actually say “everything the IPCC says” is not worth the “bucket,” you referred specifically to the expert judgement by the author team or from a formal quantitative survey of expert views,” which is worse than worthless. All that does is provide some air of “authority” to baseless propaganda masquerading as “science.”

So in that respect, I think you’re still being too generous. 😀

Brian Dingwall
August 11, 2021 12:19 pm

… structured expert judgement (i.e., a formal, calibrated method of combining quantified expert assessments that incorporate all potential processes)

Structured “judgment” of experts who have an obvious interest in a particular outcome

Coeur de Lion
August 11, 2021 12:23 pm

Read Donna Laframboise.

Marlo Lewis
August 11, 2021 12:32 pm

Thanks for this post Willis. How might the IPCC respond?

Very likely, the IPCC would claim that global sea-level rise is already close to 4 mm per year. From A.17. of the Summary for Policymakers (SPM):

“Global mean sea level increased by 0.20 [0.15 to 0.25] m between 1901 and 2018. The average rate of sea level rise was 1.3 [0.6 to 2.1] mm yr–1 between 1901 and 1971, increasing to 1.9 [0.8 to 2.9] mm yr–1 between 1971 and 2006, and further increasing to 3.7 [3.2 to 4.2] mm yr–1 between 2006 and 2018 (high confidence). Human influence was very likely the main driver of these increases since at least 1971. {2.3, 3.5, 9.6, Cross-Chapter Box 9.1, Box TS.4}” 

The SPM does not say but very likely the IPCC’s estimate that sea levels rose 3.7 mm/yr during 2006-2018 is based on satellite measurements, which began in 1993. Tide gauges show a constant rate of increase, satellites show a faster rate ever since the satellite record started. That is typically treated as evidence of an acceleration.

However, it may be because tide gauges are accurate than satellite measurements or vice versa.

I think we would need a definitive resolution of the divergence between tide gauge- and satellite-based measurements before we can definitively reject the IPCC’s 4 mm/year projection of sea-level rise in the 2020s.

M Courtney
Reply to  Marlo Lewis
August 11, 2021 2:33 pm

Part of my comment on the AR6 review thread may need repeating here. It quotes the relevant part of the report.

Cross Chapter box 9.1 (9-100, page 2250 on my PDF).

The observed global mean sea-level (GMSL) budget is assessed through comparison of the sum of individual components of GMSL change with independent observations of total GMSL change from tide gauge and satellite altimeter observations.

The assessed sum of the observed components indicates that GMSL very likely increased by 72 to 117 mm over the period 1971-2018 (Table 9.5), with the largest contributions from ocean thermal expansion (50%) and melting of ice sheets and glaciers (42%). The assessed total GMSL change (Section 2.3.3) for the period 1971-2018 has a very likely range of 73-146 mm.

See - Owe to Rich
Reply to  Marlo Lewis
August 11, 2021 2:37 pm

IPCC also allows for isostatic rebound, wherein the land is rebounding from its being weighed down by ice sheets 20000 years ago. I think this is how they manage to turn Willis’s 2mm into 4mm p.a.

AGW is Not Science
Reply to  See - Owe to Rich
August 12, 2021 9:32 am

I seem to recall another new “adjustment” for the alleged “sinking” of the sea floor due to the weight of the water increasing due to whatever “additions.”

Which has %$#& all to do with relative sea level rise, so what difference does it make, even if is real?! If the sea level isn’t threatening shoreline houses (which it won’t be to the extent it isn’t “seen at the beach” because the sea floor is sinking instead of the water level rising), not seeing the “problem.”

But hey, anything that feeds the “It’s worse than we thought” bullshit.

Stephen Philbrick
August 11, 2021 12:32 pm

I’ve always had trouble understanding something about sea level rise.

Given that water can flow unimpeded, why isn’t it the case that the sea level rise at every location, adjusted for the subsistence rise of the earth at that location, should be a identical at all locations (obviously subject to measuring error)?

Are there factors i am missing?

Reply to  Willis Eschenbach
August 11, 2021 4:43 pm

Just nitpicking .. #4,5, and 6 should not change the sea level rise.

Reply to  Curious George
August 11, 2021 7:46 pm

#4 can change slowly over time as fluids in the mantle slosh about.

Reply to  Stephen Philbrick
August 11, 2021 3:37 pm

Factors that affect Mean sea level between locations:
* Gravity pull by sun, moon (daily tide cycle, waves can continue or reflect like trailing echoes in an old cathedral);
* Gravity pull by land (large land mass rising up from the average attracts more water);
* air pressure above the water;
* wind pushing the water from an area, to another coast (shape of sea floor and other land forms impeding flow affect this);
* small amount as water flows from flooded land ie. river flow, or pushed by volcanic activity;
* tiny amount from temperature change & evaporation because the movement of water is not instantaneous on the global scale.

MSL measured by tide gauges can change independent of true water level because:
* not built on solid rock ie. sand & mud are highly compressible and can be pushed out to neighbouring areas so land level sinks over time;
* geological process like the movememt of tectonic plates, rebound from previous ice loss (land is pushed down by ice but bounces back);
* additional weight of buildings & pumping out of water from below accelerates sinking;
* previous voids from mining, natural process or construction then allows ground to sink.

Satelites are measuring mm with instruments, position & methods which are about +/- 10cm per sample (they assume sub mm accuracy from 1000’s of samples). They seem to drift and increase the measurements overtime compared to geological stable tide gauges on the coast.

Stephen Philbrick
Reply to  tygrus
August 14, 2021 12:58 pm

Thanks to both Willis and Typrus for comprehensive responses

First a couple general comments:

  1. I continue to be impressed by the knowledge of the participants hearing their willingness to share their knowledge.
  2. The more I read about many aspects of climate change science, the more I realize how complicated the entire system is it helps persuade me that existing models are not yet up to the task.

More specific comments:
I was not unaware that there are a lot of good reasons why one would not expect the distance from the center of the earth to the ocean surface to be a constant. The fact that the earth is not a sphere, and variations in gravity contribute to that expectation. The interactions of the sun and the moon and differential centripetal forces on tides affect the readings at any particular point in time, but should generally average out over modest lengths of time. Each of these can affect the absolute sea level but I don’t think any of them contribute to a differential trend.

The movement of tectonic plates and glacial rebound are both part of subsistence (I think). Mining excavation, building construction and fluid extraction can lead to surface sinking. Tygrus also pointed out the implications of gauges located on solid rock versus compressible foundations I knew all that but have a deeper appreciation that modeling subsistence has more independent variables than I had previously considered. I was well aware that gravity is not constant over X and Y (surface coordinates), but hadn’t fully considered that it also varies over T (time), due to the fact the tectonic shifts as well as glacial movement will affect the local gravity. I am very aware that temperature and salinity affect the sea level trend. ( I once did a back of the envelope calculation was surprised to conclude that temperature was a bigger contributor to sea level rise than glacial and non-floating ice sheet melting). While I understand both tribute to sea level trend I’ll be surprised if they are material contributions to differential sea level trend expectations. 

That said, while the list of contributing factors is longer than I might’ve listed on my own, I remain convinced that if I were in charge of science I would approach it differently:

  1. Step one — build a model estimating land subsistence by location reflecting relevant factors such as tectonic movements, rebound, construction, mining, fluid extraction etc.
  2. Step two — measure sea level net of the effect of step one, and do the calculations over a time period such that tight, some, moon, wind, currents etc. all that out to zero and see what’s left.

I don’t think the present approach makes a lot of sense.

August 11, 2021 12:35 pm

“quantified expert assessment”

A guesstimate at best

AGW is Not Science
Reply to  fretslider
August 12, 2021 10:04 am

Too kind, once again.

Let’s be more blunt – “Unsubstantiated bullshit.”

Bruce Cobb
August 11, 2021 12:47 pm

It’s hilarious that they use the word “confidence”, since they are all essentially playing a confidence game, and thus are “con men”.

Tom Abbott
Reply to  Bruce Cobb
August 11, 2021 6:08 pm

Excellent point!

It’s a “confidence” game at the IPCC.

August 11, 2021 1:15 pm

“The sea-level rise has been stable for a century and a half at 2 mm per year, which is just under 8 inches per century.”

I read many many years ago that California’s Central Valley has sunk 20-30 feet compared to Gold Rush days of 1850, attributed to pumping out so much underground water.

How far would this sinking effect the coast 100 miles away? Have there been any discussions of the cost sinking even a few inches? If there were a sudden 20-30 foot discontinuity in the Coastal Range, say, it would have been noticed.

Cheshire Red
August 11, 2021 1:35 pm

By keeping a high scenario option in-play they guarantee hysterical media headlines. That’s all the 8.5 nonsense is there for.

The obvious reality goes unreported by MSM and unquestioned by politicians; a 2 meter rise by 2100 requires an 800% increase of current 3mm per annum rates for 79 straight years!

There’s an F-word to describe this nonsense and it’s not science.

August 11, 2021 1:57 pm

Are this summer’s high temperatures caused by ‘global warming’ ?
Apparently NOT !
The highest temperature ever recorded on the European continent is 48C (118.4F), recorded in Athens on 10 July 1977

Last edited 1 month ago by Vuk
Wim Röst
August 11, 2021 2:07 pm

IPCC reports are written by….. volunteers (!)

Hundreds of experts in different fields volunteer their time and expertise to produce IPCC reports. Thousands more contribute to the review process and to the literature and other knowledge that are assessed in IPCC reports. These scientists are not paid by the IPCC. Here are different ways to get involved.”

Source: https://www.ipcc.ch/about/engage_with_the_ipcc/

WR: Volunteers often want ‘to do good’ (from their viewpoint / according to their belief). This could result in a big bias in the IPCC reports, amplified by the fact that the IPCC does not work following the scientific method.

From the same source: “Becoming a chapter scientist is an opportunity for Early Career Researchers to gain important insights into what it means to work at the science-policy interface, work first-hand with leading international experts and build a global network of research contacts.”

AGW is Not Science
Reply to  Wim Röst
August 12, 2021 10:13 am

important insights into what it means to work at the science-policy interface

Wow. That’s a loaded statement. Sounds like codespeak for “creating sciency bullshit that pushes political agendas for beginners.”

August 11, 2021 2:10 pm

Are the Maldives under water yet? And Manhattan?
TIme to dig out their previous “predictions”.

Reply to  Robber
August 11, 2021 2:32 pm

Land surface of the Maldives is at risk of being pushed down below the waves by the accumulated weight of cash-filled briefcases 💼.

Walter Sobchak
August 11, 2021 2:18 pm

California Tumbles Into the Sea:

Albert H Brand
August 11, 2021 2:47 pm

There is a video on the internet that explains how the level is not uniform but dependent on mass nearby attracting the water ( gravity) and the fact that the earth Is not spherical. Therefore it’s anybody’s guess what the real numbers are.

August 11, 2021 3:41 pm

Let’s face it, all they’re doing is publishing a formally constructed series of outright lies, pretending to be ‘science’, to mislead people and steal public money, via a global fear-campaign, using the totally corrupt corporate and loony left public mass-media to try and scare involuntary money ‘donations’ out of people’s wallets via gutless and totally corrupt ‘democratic’ governments, in predominantly white Euro-majority countries and formerly white Euro-dominated colonial populations.

As no one else takes this UN IPCC climate-clown circus seriously, or will pay these crooks anything, or will put-up with the global con-jobs and continual lies and fraud they are pulling on us all.

And the only other countries that give a stuff about this are the devious slimy ones who are also trying to get some climate-cash scraps from the UN’s climate-heist banquet table.

Mean while China has zero intention of doing anything about CO2 emissions, and the UN has zero intention of making that any sort of issue or contention.

This is about as prejudiced, racist, one-eyed, hypocritical and insidious an agenda, of flagrant open crookedness, as you could possibly get, at a global level.

So much for a “Uniting” of the Sovereign Nations of the World in a common cause to deal with real global issues confronting humanity.

On top of this, CO2 is a minor gas that feeds plants via respiration, and thus feeds all life on earth, and greens the world in the process, and H2O, the other extraordinary global-greener, is also by far the greatest Greenhouse gas. So when are human H2O emissions going to be reduced too then?

No more pee-pees for you! … UN said so … think about the climate … safety first!

Last edited 1 month ago by WXcycles
John Phillips
August 11, 2021 3:50 pm

I see you’ve done the Spencer/Christy thing of jettisoning uncertainties, which are rather wide – so for the projections we see just the median values rather than the more usual 5-95 percentiles. For example the 2020 San Francisco values under the medium confidence ssp119 scenario are 3.8 (1.8,6.8) mm/yr-1 which embraces the values from the NOAA of 1.98 +/- 0.18 mm/yr. In fact the uncertainties for that scenario would seem to overlap all the way out to 2100AD.

The IPCC estimate for the contribution of vertical land movement at SF subtracts just 20mm after a century. I suspect this is too small and may be a contributory factor to the mismatch.

Also the Virginia Institute of Marine Science did find acceleration at the SF station, which if it continued would be enough to add an additional 15cm by 2050.


Given the history, and presuming your aim is to persuade, could you provide a reason anyone should find your analysis more credible?

Reply to  John Phillips
August 11, 2021 4:59 pm

I don’t trust “scientists” who predict a noisy signal from a very short (one year) sample. You could get fantastic predictions by extrapolating measurements from a 6 hour interval between a low tide and a high tide.

Last edited 1 month ago by Curious George
John Phillips
Reply to  Willis Eschenbach
August 12, 2021 1:45 am

Well, quite. You rudely say the IPCC projection is ‘all over the map’, most would say it has a large uncertainty range – a range which means if you were to draw the plots with the uncertainties in observations and projections – old fashioned things called error bars – you would see they actually overlap. Will you publish such a plot?

California experiences slow subsidence due to glacial isostatic adjustment with rates up to ~2 mm/year at latitudes >37°N and up to ~1.5 mm/year at lower latitudes 

– from the paper I linked to.

Indeed the approach to uncertainties and significance around here seems a little shall we say, ‘fluid’. For example a recent post on an alleged but as it turned out, insignificant US cooling trend, also published without error bars..

“John, you are 100% correct that I did not publish the uncertainties of the answer. In fact, it is NOT statistically significant. However, that wasn’t my point. My point was that millions of folks are convinced that the US has been warming rapidly in the 21st Century, and we don’t know that at all. Not only do we not know that, but the Berkeley Earth and CERES data both show cooling, and although it is not statistically significant cooling … it’s still cooling.” 

I leave folks to guess the author. So the data show acceleration at SF. It may not be statistically significant acceleration – but it is still acceleration 😉 

Thanks for the chart showing the acceleration at SF is itself accelerating!

All the best.

John Phillips
Reply to  John Phillips
August 12, 2021 2:21 am

PS I found this NAS document from 2012,

Sea-Level Rise for the Coasts of California, Oregon, and
Washington: Past, Present, and Future (2012)

They have projections consistent with the ones in AR6

San Francisco, CA, baseline 2000. Rise in cm (low scenario, high scenario.) 

2030 7.8 (6.1–9.6)   Rate:2.6mm/yr      
2050 17.6 (12.7–22.3)  Rate:3.5 
2100 57.6 (37.3–76.1)  Rate:5.7

Just maybe the IPCC are on to something? LOL.

John Phillips
Reply to  Willis Eschenbach
August 12, 2021 12:26 pm

“you could pick just about any number and claim it is “consistent with the ones in AR6”.”

But you wrongly claim the historical rate is inconsistent 😉

John Phillips
Reply to  Willis Eschenbach
August 12, 2021 3:26 pm

Nope. Each projection has an attached scenario. If the projection comes to pass we can examine the relevant scenario, if that did not also instantiate we can claim an error, otherwise, well not so much.

You genuinely are the gift that keeps on giving.

John Phillips
Reply to  Willis Eschenbach
August 12, 2021 12:21 pm

As a result of not calculating significance and using EEMD, their analysis is fatally flawed.

Utterly predictable.

John Phillips
Reply to  Willis Eschenbach
August 12, 2021 12:58 pm

First you post a link to what you call my “history”, which busts me for using empirical mode decomposition to explore sea level acceleration.

Did you forget? They were also concerned about the examination of just a handful of stations, the base criticism being one of cherry-picking :

 Only European and US tide-gauge records are shown. Because these tide gauges are relatively close to the places where most of the ice melt that has driven sea-level changes since ~1900, they will see much less sea-level rise from ice melt than the global mean due to gravity and solid-Earth effects. Therefore, without explicitly taking this into account, we cannot say anything about global sea levels based on records in Europe and North America alone. When all available tide-gauge records are combined to compute global sea levels, a clear acceleration in sea level since 1900 is visible
I am not aware that this charge has been rebutted.
Don’t like EEMD? They got a comparable value using the conventional (coefficient of the quadratic term in a polynomial regression of the second degree) method.

For the entire record, a value of +0.011 +/- 0.003 mm/y2 was obtained for the acceleration and its uncertainty, compared with +/-0.013 mm/y2, using the conventional approach
So mode decomposition is useless when it shows no acceleration but absolutely fine when it does, the IPCC projections for San Francisco are so broad they are consistent with any trend but they are not consistent with the historical trend.
Keep ’em coming 😉

Last edited 1 month ago by John Phillips
John Phillips
Reply to  Willis Eschenbach
August 12, 2021 3:41 pm

IPCC projections are so broad that they embrace any trend you care to include.

IPCC projections are inconsistent with the historical trend.

I decline to reproduce my plots with appropriate error bars.

Mode decomposition is fine when it shows no acceleration but absolutely useless when it does.

Nothing I have posted is relevant on a global scale. (I DIDN’T SAY ANYTHING ABOUT GLOBAL SEA LEVELS.)

Genuinely the gift that keeps on giving. Please never stop. 

Last edited 1 month ago by John Phillips
Reply to  Willis Eschenbach
August 13, 2021 7:50 pm

Surprised you put up with the fact free chump as long as you did.
Longer than I would have.

Stephen Philbrick
Reply to  Willis Eschenbach
August 14, 2021 1:02 pm

Brian, I don’t write for the person I’m writing to. I write for the lurkers.

I appreciate that.

Peter D
August 11, 2021 3:59 pm

I looked at where the “experts” buy their fancy houses with their grant money. Waterfront property, the experts obviously do not believe there is a risk from sea level rise. So I bought an old beach shack scarcely 1meter above the high water.

Last edited 1 month ago by Willis Eschenbach
August 11, 2021 4:31 pm

Willis, I like what you did there with UN Eye PC Sea Level. Creative.

AGW is Not Science
Reply to  Willis Eschenbach
August 12, 2021 10:21 am

I did, but figured everyone else did too, so I didn’t say anything.

August 11, 2021 5:03 pm

Barack Obama flew in a bunch of friends on their private jets to Martha’s Vineyard to celebrate his birthday.
He put his multi-million dollar, oceanside mansion in further peril with the release of all that added CO2 into the atmosphere.
The stuff horror films are made of.

Tom Abbott
August 11, 2021 5:33 pm

From the article: “Bear in mind that this is the result of “a formal, calibrated method of combining quantified expert assessments that incorporate all potential processes”. Doesn’t that make you feel all warm and fuzzy about the rest of the UN IPCC AR6 claims?”

The IPCC report is such a joke!

All they had before was pure speculation. No evidence. Now, the only difference is their pure speculation is being presented as established fact.

That’s not going to work on the skeptics. We know the difference between speculation and evidence. Any logical person can tell the difference.

Wim Röst
Reply to  Tom Abbott
August 12, 2021 10:23 pm

Tom Abott: “Any logical person can tell the difference”.
WR: An important difference between speculation and evidence is the search for ‘quantity’ instead of the search for ‘quality’. Quantity does not say anything about the quality of the content. Let alone about evidence.

Robert of Texas
August 11, 2021 6:42 pm

There are several viable ways they could end up being right…
1) They already are experts at modifying data – all they have to do is combine the sea level rise data with something that will make it look larger, so possibly a river or lake level rise (taken in the Spring).
2) They can still adjust the length of a millimeter that is only used when describing sea level rise.
3) They can claim mm means something different, so just like option 2 but completely different.
4) They can just keep spewing nonsense until everyone forgets about their sea level increase prediction and then in 10 years they can claim they were right (but not using any specifics so no one knows what it was they were “right” about).

AGW is Not Science
Reply to  Robert of Texas
August 12, 2021 10:25 am

I’m reminded about the “story” somebody tells in the movie “Tin Men,” where one aluminum siding salesman employed a yardstick with six inches cut out from the middle of it, and would hold his hand over the break when taking the measurements used to “price” the siding job.

The really sad thing is, I wouldn’t put something like that past the alarmists – they will truly go to any lengths to push their mass lunacy.

Harry Passfield
Reply to  AGW is Not Science
August 12, 2021 3:22 pm

Great movie! Particularly liked the $10 drop to test the honesty of the mark.

August 11, 2021 6:48 pm

Is there a direct link to the IPCC AR6 Sea Level Projection Tool? I love contrasting the WAG of predictions by the alarmist cabal with measurements of the real world to my friends who have inadvertently drunk the Kool-aid and let them see for themselves the fantasies concocted by the cabal to deceive the gullible. There is no more convincing proof that, as former President Trump said, global warming is the biggest hoax ever perpetrated.

NOAA Sea Level Tends

August 11, 2021 6:57 pm

I had gotten familiar with the 4 RCPs after AR4 and AR5.
Now we have to familiarise ourselves with 5 new pathways,SSPs 1.9,2.6,4.5,7.0 and 8.5.
Yes, I can see some loose association with the earlier RCPs.
What is a “Shared Socio-Economic Pathway” (SSP) anyway,other than new guesswork?
As your analysis shows,they may ALL be divorced from reality.
May I cheekily suggest a sixth SSP, “1.0”

Tom Abbott
Reply to  Herbert
August 12, 2021 8:41 am

Yes! a 1.0 is called for.

At least in this case (the 1.9), the IPCC is going in the right direction: cooler.

August 12, 2021 12:13 am

0.65mm/yr at Fort Denison in Sydney Harbour for 124 years-
Sea Level Trends – Sydney, Fort Denison 1 & 2, Australia – NOAA Tides & Currents

and 0.85mm/yr at Port Arthur in Tasmania for 159 years-
:: Sea-level Rise :: CSIRO & ACECRC ::
although John Daly reckons that’s a bit on the high side

At those rates Australians will be keeping a close eye on San Francisco to see when we’re next cab off the rank for being doomed.

August 12, 2021 1:00 am

Most of the AR6 narrative is built up over the same unscientific methods, and deserve the diagnosis Intergalaxial Crap of the Highest Order.
No less. But probably also no more.
Unless these rocket climate scientists invent a new climate neutral universe in AR7….

August 12, 2021 4:00 am

OK, I will ‘splain it to the leftist woketards again. The sea level rises, then falls, then rises, then falls, then rises, then falls. It is called tides, morons and humans can not stop it, just as the climate changes constantly and humans can not stop it, either. What a pack of f**king idiots.

August 12, 2021 4:54 am

This should be added to the Everything Climate section under “Sea Level Rise is Accelerating Dramatically”. Also, any way to put this on YouTube or NewTube?

August 12, 2021 5:25 am

What grade sould a Freshman Earth Science Student receive (on an assigned report) that included a Sea Level Rise prediction FOR THIS YEAR that is 100% higher than what the data indicate for this year?

(Sadly, probably would get an “A”…should get a “D” at best).

August 12, 2021 5:57 am

On Monday, our “local trusted news source” posted on Facebook this worrying headline:

The world is “locked in” to 15 to 30 centimeters (6 to 12 inches) of sea level rise by mid-century, said report co-author Bob Kopp of Rutgers University.

Oh, noez!

Here was my reply:

The Experts predict 15 to 30 cm of sea-level rise by mid-century. Let’s call that 150 to 300 mm by 2050, roughly 30 years from now, making for a sea-level rise rate of 5 to 10 mm per year starting now. The observed sea-level rise since 1900 is a linear trend of about 1.40 +/- 0.13mm per year. Sorry, I don’t buy it. The experts need to put their computer games, err.. models, away. https://sealevel.info/MSL_weighted.php?id=Harlingen,%20Honolulu&boxcar=1&boxwidth=3

The replies from the nattering facebook nabobs included the usual “you’re no expert, so there!” I will admit that my grammar and composition are not up to the highest standard, but I think I made my point.

Alan Watt, Climate Denialist Level 7
August 12, 2021 7:14 am

“expert judgement by the author team or from a formal quantitative survey of expert views” may not be worth a bucket of warm spit.

The phrase “not worth a bucket of warm spit” is commonly attributed to Texan John Nance “Cactus Jack” Garner, a banker and rancher from Uvalde, TX who rose through the state house and US Congress, becoming Speaker of the House in 1931 and eventually a two-term Vice President under Franklin Rosevelt. He was never actually quoted as saying it at the time, but several biographies attribute that or a similar phrase to him describing the US Vice Presidency later on.

One 1978 biography claims Lyndon Johnson called Garner in 1960 to discuss the offer he’d received to be John Kennedy’s running mate and was told “I’ll tell you Lyndon, the vice presidency isn’t worth a pitcher of warm spit”. The biographer later stated that the actual phrase was “pitcher of warm piss”, which journalistic sensitivities of the era would not allow to be printed.

There is no dispute Garner was the source of many pithy and salty expressions regarding the vice presidency, among which are:

I don’t intend to spend the next four years counting another man’s coat tails.

Our firm has two members. The senior member does all the talking and I do all the work.

There cannot be a great vice president. A great man may occupy the office, but there is no way for him to become a great vice president because the office in itself is almost wholly unimportant.

Worst damn-fool mistake I ever made was letting myself be elected vice president of the United States.

The vice presidency is the spare tire of government.

When I switched from speaker to vice president, it was the only demotion I ever had.

I am vice president of the United States. you’d better stick around a while—you might pick up some new ideas. [spoken to a circus clown]

Having split with Rosevelt on many policy issues, Garner left office and returned to Uvalde in 1941, vowing never to cross the Potomac again.

He refused to donate his vice presidential papers to the University of Texas and instead burned them all. No doubt we lost a lot of other quotable thoughts and observations that were too spicy to print at the time.

Garner died in 1967 at age 99.

So take your pick: “bucket of warm spit” or “pitcher of warm piss”. Either one works; climate science is even more useless than the vice presidency. Were he around today, I bet “Cactus Jack” Garner would have something scathingly appropriate to say about it.

AGW is Not Science
Reply to  Alan Watt, Climate Denialist Level 7
August 12, 2021 10:31 am

I’m sure his summary of the “climate crisis” nonsense would have been both colorful and on point!

August 12, 2021 7:42 am

Willis, thanks. You always bring up these marvelous graphs.
This is maybe a bit off the topic, but I am interested to hear what all of you of have to say about my story.
First off all, look at this plot:

Assuming it is indeed possible to measure oxygen to the accuracy that is claimed. It says:
‘This corresponds to losing 19 O2 molecules out of every 1 million O2 molecules in the atmosphere each year.’ This is a bit of a strange unit to use, but anyway, it is how it is.
I wonder if you are actually measuring an actual loss of O2, rather than a fluctuation in the volume of the atmosphere. But again, assuming the measurements are representative of the true loss of oxygen from the atmosphere, I calculate this loss to 0.4 ppm O2.
(9/10^6 = y /6.02×10^23. Once you solved y, you know the amount of oxygen lost per mole oxygen.
That 0.4 ppm oxygen correlates to 44/32 = 0.55 ppm CO2.

Note that this annual 0.5 ppm CO2 increase in the atmosphere is a lot less that what is actually observed.

That brings me to my point:

I am still not sure whether the increase in CO2 of the atmosphere is due entirely to the use of fossil fuels. Remember, there are huge amounts of carbonates and bicarbonates in the oceans. In fact, giga tons. The wastewater of 7 billion people and even more animals and many factories is usually weak acidic and sometimes even really acidic. Especially in the countries where the pH of the waste water is not looked at at all. All that acid ends up in the oceans.
Once this waste comes into the oceans, I think there follows a simple reaction:
HCO3- + H3O+ = > CO2 (g) + 2H2O
Even if the pH of the seawater is not acidic in itself, that reaction does happen, simply because there is a disturbed balance. Nature wants to put that right.
I’ve been taking samples from the Indian Ocean every year for the past five years. We’re going back there on vacation soon. I would like to know if there is a downward trend in the alkalinity of those seawater samples.
Is there anyone here who’s interested in helping me with this project? (I don’t have a lab and actually no money to pay for such an investigation)

Reply to  HenryP
August 13, 2021 12:41 am

Hi Willis. Thanks. I think I may have made a mistake. Let me look at my calculations again.

Reply to  HenryP
August 13, 2021 10:57 am

I did make a mistake somewhere, not taking into account the % oxygen in the atmosphere. Now I get to a loss of 2.2 ppm oxygen. This does not correspond to your result but it does explain the increase in CO2.
Assuming Keeling is not cheating.

Reply to  HenryP
August 13, 2021 10:59 am

I am puzzled not seeing the results anywhere for the loss of oxygen since 2017.

August 12, 2021 9:33 am

If we wanted to really find out what the author’s “expert judgement” is for how much the sea is to rise at the end of this decade, we should insist that they put up $10,000 and write down their best estimate, with the closest one winning all of the money. Maybe allow three rounds of bidding before being stuck with the final estimate in order to see how low they go.

Jeff Kalwerisky
August 12, 2021 1:38 pm

The essential issue here is: can we EVER model the globate climate, accurately? Strangely, that doesn’t appear to be a question that took up much of the IPCC panel’s time!
Logically, one would think the answer is Yes, namely, when we can build sufficiently large computers, we should be able to model the atmosphere and seas to an accuracy of, say, one centimeter (currently, it’s more like one kilometer.)
But lots of well-established theory and experiment say this is false. Why?
For one very good reason: the weather – and, by implication, the global climate – is a non-linear, dynamic system, aka a chaotic system. That means it has inherent uncertainty, no matter how accurately we measure initial conditions.
Therefore, even if we could build a computer the size of the planet, we will NEVER be able to make accurate long-term predictions about the local climate, let alone the global.
This inherent uncertainty is built into the fabric of our Universe. We can’t change it or predict it any more than we can change the strange ways the Universe seems to work down at the quantum level.
For a clear example of a chaotic system, watch this video of the simplest such system: Double Pendulum Displays Chaotic Motion – YouTube

Wim Röst
Reply to  Jeff Kalwerisky
August 13, 2021 1:28 am

A very good and important comment.

Weather is chaotic, unpredictable. Climate is the average of 30 years of weather and so: unpredictable. Furthermore, weather and oceans influence each other. Oceans are unpredictable as their behavior is dependent on local salinity and temperature, which are both dependent (among others) on unpredictable weather.

Who tells he is able to predict climate (IPCC) must be very innocent. At best.

Who has confidence in an innocent group of volunteers (IPCC) who know just one cause for all chaotic behavior of weather and climate and suggest they can stabilize future weather and climate (which have never been stable during the last 4 billion years) must be very naive: most media, politicians.

Steve Fitzpatrick
August 12, 2021 5:13 pm

Hi Willis. I think I found one error: The word ‘spit’ should have been “urine”. Other than that, perfect.

Walter Horsting
August 13, 2021 6:21 am

During the next minor cooling cycle I’d expect the sea levels will decline an inch or so….

Mick Moss
August 13, 2021 2:10 pm

Why do they use San Francisco for sea level studies? San Francisco sits directly above the San Andreas Fault……… Sea level is falling in most of Alaska due to tectonic pressure change. I should think that appropriate sea level studies should involve hundreds of long term tide measurements around the world.

Jim Whelan
August 14, 2021 9:41 am

The IPCC confidence levels have always been based on guesses obtained from one end of the alimentary canal of the “experts”.

They are ofen combined using “Bayesian analysis” which though it does a good job of improving valid results obtained from diffrerent sources really doesn’t do much for alimentary excretions from those who have all consumed the same meals.

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