USGS plays the '100 year threat' game with sea level rise

From the “not a verifiable forecast” department, and the “auxiliary department of funding acquisition worry” comes this headline from USGS today. Some other 100 year headlines follow.

Study Shows Sea Level Rise to Threaten West Coast Tidal Wetlands Over the Next 100 Years

 U.S. Geological Survey technician collects elevation data using a real time kinematic GPS at Bandon National Wildlife Refuge. Location: Bandon Marsh National Wildlife Refuge, OR, USA Date Taken: 8/27/2012 Photographer: Katherine Powelson
U.S. Geological Survey technician collects elevation data using a real time kinematic GPS at Bandon National Wildlife Refuge. Location: Bandon Marsh National Wildlife Refuge, OR, USA Date Taken: 8/27/2012 Photographer: Katherine Powelson

CORVALLIS, Oregon – The U.S. Geological Survey and Oregon State University released a report this week examining Pacific Northwest tidal wetland vulnerability to sea level rise. Scientists found that, while vulnerability varies from marsh to marsh, most wetlands would likely be resilient to rising sea levels over the next 50-70 years. Beyond that time, however, most wetlands might convert to intertidal mudflats as sea level rise outpaces the capacity of tidal marshes to adapt.

“This study provides critical scientific findings to help natural resource managers develop and implement conservation and adaptation actions as the coastal areas of Oregon and Washington prepare for rising sea levels,” said the Department of the Interior’s Northwest Climate Science Center director, Gustavo Bisbal. “Delivering robust science with practical management application is of focal significance to our science program.”

Coastal wetlands provide economic and recreational benefits to local communities by creating critical habitat for important local fisheries. They also support a wealth of ecosystem services such as water purification and flood protection. Until now, the vulnerability of these critical habitats to rising sea levels had been poorly understood, leaving resource managers with little information for coastal adaptation planning or strategies.

“This information is timely and at the scale needed to help coastal resource managers plan for climate change,” said USGS project lead, Karen Thorne. “One clear result is that wetlands are more vulnerable to sea level rise in areas with higher human impacts to the local ecosystems.”

The research aims to inform tidal marsh management of vulnerabilities along Washington and Oregon coasts and is part of a larger effort to examine tidal marshes from Washington down to the border with Mexico. Scientists took a thorough snapshot of current conditions at nine tidal marshes, measuring elevation and current range of low and high tides, and mapping plant life and current and historic rates of sedimentation. The group then used models of sea level rise to calculate vulnerability for each marsh, testing whether vulnerability varies from north to south or among wetlands. Two coastal National Wildlife Refuges, Grays Harbor and Willapa Bay in Washington, appear to have the most resilience, persisting as low marsh for at least the next 100 years. But sea level rise will eventually outpace marsh growth and drown most high and mid-marsh habitats by 2110.

The study was a partnership of the USGS, Oregon State University and the University of California, Los Angeles. The work was supported by the DOI Northwest Climate Science Center, which is managed by the USGS National Climate Change and Wildlife Science Center. The center is one of eight that provides scientific information to help natural resource managers respond effectively to climate change.

The final report is available online. Additional project information can be found at the USGS Western Ecological Research Center.


USGS provides science for a changing world. Visit USGS.gov, and follow us on Twitter @USGS and our other social media channels.

Subscribe to our news releases via e-mailRSS or Twitter.

Links and contacts within this release are valid at the time of publication.

###
Since they’ve listed 100 year threats, I thought I  might list some other similar century scale threats that might come true, but are equally unverifiable today
  • Over the next 100 years, we might see a devastating asteroid impact on Earth.
  • Over the next 100 years, wind and solar power might replace every other electricity source.
  • Over the next 100 years, only the elite will be able to afford electricity.
  • Over the next 100 years, rising temperatures on Earth will make it uninhabitable, and we’ll have to flee to another planet.
  • Over the next 100 years, the Arctic ice cap will be gone, oh wait, that was last year.
  • Over the next 100 years, Michael Mann might become a hero to the world for warning us about global warming by beating it into our heads with a stick.
  • Over the next 100 years, former IPCC chairman Rajenda Pacharuri’s record might be expunged to make it look like (in Mark Steyn’s words) he’s not a “sex fiend”.
  • Over the next 100 years, we might finally get those flying cars we’ve been promised.
  • Over the next 100 years, everyone reading this will likely be dead.
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Resourceguy
August 14, 2015 10:02 am

Meanwhile they let the landslide threats slide by in other areas, as seen in Washington.

Reply to  Resourceguy
August 14, 2015 10:19 am

I remember reading in the Washington (state) press that the Oso landslide was caused by logging and climate change.
http://www.huffingtonpost.com/ellen-moyer-phd/landslide-in-oso-washingt_b_5135878.html

Resourceguy
Reply to  Cam_S
August 14, 2015 11:19 am

And a lot of looking the other way by those on salary to pay attention to risk.

Windsong
Reply to  Cam_S
August 14, 2015 12:55 pm

The 2014 Oso landslide was primarily the result of erosion at the base of the cliff by the North Fork Stillaguamish River; undercutting, not clear cutting. Just like many of the previous slides at the same spot, hence the nickname for the hill: “Landslide Hill.” Ellen Moyer probably could not be bothered with an update to her original story.
http://www.seattletimes.com/seattle-news/science/laser-map-gave-clue-to-oso-slides-ferocity/
Back to the endangered coastal wetlands: Sandi Doughton, science reporter (above) for the Seattle Times, would probably make a case for those wetlands to be inundated after the next subduction zone earthquake off the Oregon coast. Possibly before the 100 years go by.
http://www.amazon.com/Full-Rip-9-0-Earthquake-Pacific-Northwest/dp/1570619425

Reply to  Cam_S
August 14, 2015 2:20 pm

Yes the next big Cascadia earthquake will likely drop the Olympic peninsula and everything west of Seattle by 6-13 feet (2-4 meters) in about 3-4 minutes of violent shaking. Now that’s SLR.

noaaprogrammer
Reply to  Cam_S
August 15, 2015 8:50 am

…and within the next 100 years the Yellowstone Caldera could go ballistic and do much more damage than a little bit of extra salt in a fresh-water marsh.

Reply to  Cam_S
August 15, 2015 4:27 pm

It was caused (primarily) by gravity, and triggered by water (erosion as well as lower soil cohesion)
Pretty simple.

timg56
Reply to  Cam_S
August 17, 2015 2:47 pm

Ask any reputable geologist what caused the slide. It is a well known phenomenom – so well known that that ridge had already been identified as a slide risk prior to it happening.

ferdberple
Reply to  Resourceguy
August 15, 2015 4:33 pm

Only problem is 1/2 the stations on the west coast say sea levels are falling. the other half say they are rising. all within a thousand miles.
http://tidesandcurrents.noaa.gov/sltrends/sltrends.html

george e. smith
August 14, 2015 10:04 am

Seems to me that sea level rise is just what is needed to increase tidal wetlands.
So what’s the big deal.
” Tidal ” wetlands have salt water incursion, that’s why they are tidal. The critters that inhabit them are used to it rising and falling twice a day.
Another 3 mm per year is not going to disturb their habits.
g

Reply to  george e. smith
August 14, 2015 11:44 am

imagine if facial hair grew at that speed..FREEEEEEDOM

Reply to  scott frasier (@frasierscott1)
August 14, 2015 6:27 pm

My sons do not appear to care how fast it grows. You should emulate them (but, then, I’m not married to you. I do not give the same advice to my husband.)

Latitude
Reply to  george e. smith
August 14, 2015 12:16 pm

“Beyond that time, however, most wetlands might convert to intertidal mudflats …”
Intertidal mudflats are more diverse and more productive..than wetlands.
..of course, they fail to mention that as the intertidal mudflats move inland…so do the wetlands

Alastair Brickell
Reply to  Latitude
August 14, 2015 4:28 pm

Exactly…it’s pretty shameful when the USGS doesn’t accept what is normal geological variability. I would also like them to explain just why the present situation / coastline / temperature is perfect and must be preserved at any cost.

Leonard Lane
Reply to  Latitude
August 14, 2015 10:49 pm

More wild claims and limited databases t support them. The USGS might do better to spend taxpayer money on keeping streamflow gaging stations in service to serve the public need for flood analyses and forecasts and drought analyses.

Luke
Reply to  Latitude
August 15, 2015 8:56 am

Not if there are man-made dikes or natural obstructions in the way.

AP
Reply to  george e. smith
August 14, 2015 4:15 pm

These people constantly underestimate the immense capacity for biota to adapt to changing conditions.

Luke
Reply to  george e. smith
August 15, 2015 6:44 am

Many tidal wetlands along the west coast are bordered by man-made dikes. As sea levels rise the tidal wetlands will be pushed up against the dikes and, if sedimentation cannot keep up (one of the parameters the scientists are measuring), eventually disappear when the water gets too deep.

Reply to  Luke
August 15, 2015 1:51 pm

In Holland as part of the Delta Works they have actually managed to re-generate “tidal” wetlands INSIDE the storm structures. It is an amazing part of the project which is ongoing and has revitalized many species that would otherwise be killed by a straight diking system. A long time ago I was part of the project where we worked on preventing salt infiltration into the ground table to protect farm land in the west of Holland which at the time was a green house mecca for growing veggies but was threatened by the level of saline water at each flood stage of the tides in the Delta formed by the Rhine, Maas rivers.

AnonyMoose
Reply to  Luke
August 15, 2015 6:51 pm

Geologically, wetlands are temporary. They’ll either silt up or layers of plant life will fill it in. As peat bogs show, that can take a while. Of course, parts of the USGS know that.

Don E
Reply to  george e. smith
August 15, 2015 8:52 am

Also what about land level rise? Was that taken into account?

August 14, 2015 10:07 am

########
‘Since they’ve listed 100 year threats, I thought I might list some other similar century scale threats that might come true, but are equally unverifiable today”
ALL forecasts are unverifiable TODAY
I predict the sun will come up on sunday
that’s unverifiable TODAY

Gary
Reply to  Steven Mosher
August 14, 2015 10:33 am

The important word here is “equally” not “today” which only is added to distinguish that these things might be verifiable on some other day.

Reply to  Steven Mosher
August 14, 2015 10:34 am

Absurd Stephan. The point is clearly that a prediction that goes this far into the future will never be reconciled……at least not during the lifetime of those making it and likely be long forgotten by later generations that live at the time it was predicted for.
This is the realm of climate science today.
I’m an operational meteorologist. We forecast weather for up to 2 weeks on a regular basis and are held directly accountable for that forecast that corresponds to the initial 1 week(especially the first few days).
Some meteorologists will make seasonal forecasts. This time frame is not expected to show as much skill, so the standards are much lower for accuracy as would be the standard for predicting this weeks weather………..however, Winter comes and goes quickly and there is a standard to judge the Winter forecasts made prior to that Winter by.
What would be the standard to judge a 100 year forecast by?

Reply to  Mike Maguire
August 14, 2015 11:39 am

‘I’m an operational meteorologist. We forecast weather for up to 2 weeks on a regular basis and are held directly accountable for that forecast that corresponds to the initial 1 week(especially the first few days).”
I use your crap. it sucks. but it is the best we have.
A forecast that the sun will come up 100 years from now IS verifiable.
VERIFIABLE means “has empirical content”. means it can be checked IN PRINCIPLE.
forecasts of 100 year floods or 100 year sea level rises are verifiable IN PRINCIPLE, but in practice
you actually have to wait 100 years to calculate the SKILL.
with your two week forecasts I calculate skill daily.
The problem is the time horizon. So, data for assessing skill is lacking ( there are ways around this )
long time horizons are not a problem
http://neo.jpl.nasa.gov/risks/
depending on the physics involved you just have more or less confidence

Latitude
Reply to  Mike Maguire
August 14, 2015 12:18 pm

“The problem is the time horizon. So, data for assessing skill is lacking ( there are ways around this )”….
really?

Gilbertl K. Arnold
Reply to  Mike Maguire
August 14, 2015 3:20 pm

Mosher: 100 year floods have a 1% probability of occurring each and every year, You do not need to wait 100 years to verify this. You can have more than one 100 year flood in a given year. Look recurrence intervals.

Reply to  Mike Maguire
August 14, 2015 3:41 pm

Based on past predictions, and things no one predicted, I can confidently state that:
– Worrying works: 97% of the things we are worried about will never happen.
– Predictions are hard, especially about the future: No one will see the big technology shifts coming…they will happen and then people will look back and say “How ’bout that!”
– Disasters will come and go. Just like always. The big ones will be more or less surprising, depending on how well one has examined the past.
– Catastrophism will be alive and well and warning everyone that the end is nigh, and only those who repent will be saved.
Blah blah blah.

BFL
Reply to  Mike Maguire
August 14, 2015 5:01 pm

“I use your crap. it sucks. but it is the best we have.”
So I assume that your output matches…….

mebbe
Reply to  Mike Maguire
August 15, 2015 6:51 am

mosher says “I use your crap.”
cant help but wonder what you use his crap for.
planting crops? planning a parade? repairing a roof? speculating in commodities? (two week futures)
crap makes good compost

Bernie
Reply to  Mike Maguire
August 15, 2015 8:18 am

Mike – What is a reasonable median score on two week forecasts of weather? No offense meant. I suggested to my kid that she do a rolling analysis of the temperature forecasts from our daily newspaper as a science fair project. You know, record the five day forecast high and low each day. One would expect the day ahead forecast to be more accurate than the five day forecast.

noaaprogrammer
Reply to  Mike Maguire
August 15, 2015 9:00 am

Does the “sun come up?”

Reply to  Mike Maguire
August 15, 2015 4:35 pm

I think the sun stays right where it is.

Reply to  Mike Maguire
August 15, 2015 4:36 pm

Except of course, for it’s motion though the Milky Way. (BTW, is that a dumb name for a galaxy, or what?)

Reply to  Mike Maguire
August 15, 2015 4:39 pm

I mean, they might as well call our local group of galaxies the fluffernutter cluster, or the solar system the Big Cheese Omelet.

Reply to  Mike Maguire
August 17, 2015 11:27 am

Menicholas said: the Milky Way. (BTW, is that a dumb name for a galaxy, or what?).
Actually, it might be the only appropriate name for a galaxy, since it is a near-translation of the same Greek word that we have borrowed as “galaxy”. How could an ancient Greek metaphor that has given us the category name possibly be inappropriate for the eponymous token that gave us the type?

richard
Reply to  Steven Mosher
August 14, 2015 11:46 am

wow, a good game , you can make anything up.

Mick
Reply to  Steven Mosher
August 14, 2015 1:05 pm

Steven, that comment is based on verifiable historical observation. Since the sun has been observed to do just that every Sunday for billions of years. Not a good analogy.
Try harder

Taphonomic
Reply to  Steven Mosher
August 14, 2015 1:45 pm

Steven, you don’t have any idea what a 100 year flood is, do you?

Reply to  Taphonomic
August 15, 2015 4:45 pm

… no response….
We can make several judgments about someone uses an example to make an point, and they don’t understand the basic principles of the example.

Reply to  Steven Mosher
August 14, 2015 5:07 pm

The Newtonian physics-based model of the solar system has passed every single falsification test (prediction) it’s ever made. It is extremely well verified.
Climate models have passed no falsification test. They have no known predictive power at all.
Your equation of Newtonian and Hansenian models is false, Steve.

Reply to  Pat Frank
August 15, 2015 10:25 am

True, Jerzy. Newton’s theory apparently falls a bit short for sun-grazing comets, too.

ferdberple
Reply to  Steven Mosher
August 15, 2015 4:42 pm

ALL forecasts are unverifiable TODAY
==================
I forecast that at midnight the date will change.

Reply to  ferdberple
August 17, 2015 11:47 am

You see, the problem is that the “midnight” your forecast references does not happen “today”–thus cannot be verified/validated/falsified/you-name-it-ed until tomorrow. This is the trivial point made about when you get to match the prediction against reality. The non-trivial point about this trivial point is that there are conditions that are serially true, and predictably true (in a non-mathematical sense); the sun does not come up accidentally or providentially every morning; it comes up because it (and we and our part of the Universe) have been set into a context that will not, barring unforeseen events (that are increasingly less and less unforeseeable because of technology and stubbornness on our part), fail to continue suddenly and unexpectedly. This is not the same kind of forecast, of course, as that made on a chaotic, or at least stochastically variable, system.
I.e., I think a prediction that the date will change at midnight can be made with 100% confidence, given what we know collectively about the current state of our neck of the woods, but nothing about the prediction can be checked against the reality it defines (“at midnight”) until that bit of reality arrives. The confidence judgment here is not at all outrageous, because the definitions of all terms force the prediction to be self-fulfilling; the same cannot in any way be said of decades-out climate predictions.
On the other hand, ferdberple, you are quite right to call out “ALL forecasts….”, because that particular generalization is demonstrably false, but only because there are different flavors of forecasts.

timg56
Reply to  Steven Mosher
August 17, 2015 2:51 pm

But far more reliably predictable than disappearing coastal wetlands in a 100 years.
I’m curious what model output was used – i.e. what rate of rise.

tadchem
August 14, 2015 10:10 am

Add these:
Over the next 100 years, *some* life forms will learn to adapt to change rather than choose to become victims of it.
Over the next 100 years humanity will conquer more land and convert more wilderness to gardens and homes.
Over the next 100 years, we will continue to “…be fruitful, and multiply, and replenish (cultivate) the earth, and subdue (farm) it: and have dominion over (domesticate) the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth.”

August 14, 2015 10:12 am

The tide gauge record doesn’t agree with the predictions. West coast tide gauges show a decline in sea level rise over the last 60 years.

E. Martin
August 14, 2015 10:15 am

As soon as you see the buzz word “robust” in government supported “science”, it is pointless to keep reading!

Reply to  E. Martin
August 14, 2015 3:45 pm

You got that right!

August 14, 2015 10:22 am

Maybe slightly off-topic:
http://www.foxnews.com/weather/2015/08/14/forecasters-warn-this-winter-el-nino-could-be-historically-strong/

Economic studies favor the hero theme, showing that El Ninos tend to benefit the United States. Droughts and Atlantic hurricanes are reduced. California mudslides notwithstanding, the U.S. economy benefited by nearly $22 billion from that 1997-98 El Nino, according to a study.

iurockhead
Reply to  Slywolfe
August 14, 2015 7:29 pm

So, the coming “Godzilla El Nino,” as it has been named in the last 24 hours, is going to be a good thing? Gee, then why all the doom hype from the newsies? Wait, I know the answer. Sensationalism sells.

August 14, 2015 10:23 am

Over the next 100 years, ISIS jihadists might have nukes. Oh wait, make that 2 years.

Reply to  Mike Smith
August 14, 2015 2:26 pm

But but but according to John Kerry, climate is the biggest threat to mankind. Don’t tell me he is wrong?
/s

Reply to  Joel O’Bryan
August 14, 2015 3:46 pm

He is not even wrong.

Jon
Reply to  Joel O’Bryan
August 14, 2015 4:59 pm

If you want to If this AGW is BS does that mean ISIS is not a major threat to the USA? Surely not, what else could the government spend Billions of your $ on? To put it another way, how else could the government transfer your money to corporations? Is that too off-topic or just another example of the same pattern?

Jon
Reply to  Mike Smith
August 14, 2015 5:00 pm

OOPS! scrap “If you want to ” – sorry.

August 14, 2015 10:31 am

USCG participation in specuscience doesn’t seem too harmful in this case, Certainly not when compared to the “futurist” wackos over at the pentagon that have infected everything including order of battle.

Reply to  fossilsage
August 14, 2015 3:47 pm

It is their frequent forays into “edutainment” that are getting me riled.

Bruce Cobb
August 14, 2015 10:37 am

“The group then used models of sea level rise to calculate vulnerability…” Oh, so they used “models”, did they? Would these be the same “models” that keep diverging more and more from reality, that never projected/predicted an 18 1/2-year and counting long Halt in the warming, nor can they explain it, and which have utterly failed in their attempts at accurately depicting what our climate has done or is now doing. Those models?

Gary Pearse
August 14, 2015 11:05 am

Surely the wetland would just move inland a few dozen metres. They are commonly on stream deltas.

Reply to  Gary Pearse
August 14, 2015 6:47 pm

You’d think (unless you don’t think).
Here in Oregon the entire region west of I5 — the coastal range — is scraped-off seafloor from the subduction of the Juan de Fuca plate. Yet somehow the tidal zone managed to go with the flow, so to speak.
I find it amusing that those who shriek about the negatives of change, can’t seem to envision change.
It’s worse than fixed thinking. It’s broken thinking.

Reply to  Max Photon
August 15, 2015 9:57 am

Is getting your thinking fixed sort of like getting your cat spade? If you were the cat?

acementhead
Reply to  Max Photon
August 15, 2015 2:19 pm

fossilage no cat has a spade. They can’t use spades as they don’t have opposable thumbs*. All cats dig with their pause.
* Meet the Parents.

TomRude
August 14, 2015 11:07 am

“The group then used models of sea level rise to calculate vulnerability for each marsh, testing whether vulnerability varies from north to south or among wetlands. ”
Straw man argument set up since as long as they use a rising sea level model, at one point or another it will overcome land. It’s designed to do so. In fact the follwoing gets funnier:
“Two coastal National Wildlife Refuges, Grays Harbor and Willapa Bay in Washington, appear to have the most resilience, persisting as low marsh for at least the next 100 years. But sea level rise will eventually outpace marsh growth and drown most high and mid-marsh habitats by 2110.”
So they claim that these marshes will be OK for “at least” the next 100 years, that is “at least” in 2115 BUT sea level will overcome them by 2110! Can’t even proof read their press release…

Reply to  TomRude
August 14, 2015 3:52 pm

They seem oblivious to the fact that sea level has fluctuated dramatically over long time scales, and yet there are marsh adapted creatures filling every niche, and many of these species have existed for millions and millions of years.
I am becoming convinced that the new requirement to publish is a complete lack of awareness of Earth history.

TomRude
Reply to  Menicholas
August 14, 2015 9:01 pm

Agreed, at least a commitment to obfuscate, travesty or ignore it.

TonyK
August 14, 2015 11:20 am

….and I’m still waiting for my domestic robot they promised me in 2000.

Reply to  TonyK
August 14, 2015 3:53 pm

Rosie called, she wants her pay scale finalized before she starts.

Resourceguy
August 14, 2015 11:21 am

Looks like Oregon can now proceed to apply for Federal funds for its own bullet train, like CA did. It only takes an official false premise to get qualified.

Mike Bromley the Kurd
Reply to  Resourceguy
August 14, 2015 11:32 am

+1

Resourceguy
August 14, 2015 11:23 am

What did USGS say about shale oil potential in the early years?

Mike Bromley the Kurd
August 14, 2015 11:32 am

And I suppose the Ghost Forest wetlands somewhere down there are an exception. One dumb-arse M9.5 Cascadia Earthquake, and adaptation becomes a moot point. Sawgrass will survive.

FAH
August 14, 2015 11:32 am

You forgot cheap reliable fusion power. It has been just 20 years away for the past 40 years or so.

Mick
Reply to  FAH
August 14, 2015 1:11 pm

Cholesterol used to cause heart attacks. Anyone who disagreed was in the pay of the plastic fat manufacturers.

Mick
Reply to  Mick
August 14, 2015 1:18 pm

High oil prices are here to stay. We will never see oil below 100$ a barrel in our lifetimes. I used to laugh at the Experts who predicted this.
What I have learned in my relatively short life is that Experts are not experts , Most science is junk now. All the good science was done pre 1960.

Reply to  Mick
August 14, 2015 3:57 pm

Remember the so called “Mideast experts” which appeared from nowhere during the various Gulf Wars?
Not a single one ever called a dang thing correctly.
This was my first awakening to the reality that “expert” is another word for “garrulous jackass”.
Except re blog commenters. Those guys have a head on their shoulders.

adrianvance
August 14, 2015 11:35 am

This is more nonsense to get more money for the bureau. It is just that simple.
Google “Two Minute Conservative” for more.

August 14, 2015 11:37 am

“This information is timely and…”
——-
This is not information.

ShrNfr
August 14, 2015 11:51 am

The phrase “not even wrong” comes to mind. If you can not test something, it is an matter of faith and not of science. Having said that, if folks were to say that the sea level rise that we have seen for the past 500+ years will continue at that rate into the next 100 years, I could live with it since I could test the rate of rise against the historical number in a short period to see if the hypothesis was violated.

Reply to  ShrNfr
August 14, 2015 4:02 pm

Or, we could recognize that most places which are adjacent to a shoreline are regularly wiped clean my strong coastal storms.
This is why coastlines the world over mostly look about the same…few or no trees…no old ones at all…mostly rocks and …wait for it…SAND!
The stuff that is left when rock and dirt and everything else is pounded day after day by water and wave action:
http://biblehub.com/matthew/7-26.htm

Mary Brown
August 14, 2015 11:55 am

Slightly off topic but I would like some answers and opinions on this sea level question….
“How much lower would global sea level be if humans had never lived?”
I have an estimate I use but would like to see how others come to an answer.

D.I.
Reply to  Mary Brown
August 14, 2015 1:29 pm

Global ‘Sea Level’ doesn’t exist.
watch this 3 minute video.

Reply to  D.I.
August 14, 2015 4:04 pm

Yay, another of my faves!

Editor
August 14, 2015 12:12 pm

The part that seems missing to me is some understanding of the dynamic nature of such tidal marshes. For example, they say:

-Sediment Elevation Tables (SETs)
Coastal wetlands normally accrete sediment at a rate similar to the rate at which they lose sediment to erosion. However with sea-level rise, coastal wetlands are in danger of being inundated or eroded before they can refill. SETs are being used to determine changes in marsh surface elevation due to either accretion (sediment input) or erosion. SETs also measure contributions of surface and subsurface processes (i.e. root growth, decomposition, compaction, water flux) and influence of these processes on overall marsh elevation.

So they are measuring the right stuff, the sediment elevation … but they think it is in some kind of delicate balance, viz:
“However with sea-level rise, coastal wetlands are in danger of being inundated or eroded before they can refill.”
However, given that sea levels have been rising for hundreds of years … how do these folks think that the tidal marshes are still around? Obviously, the tidal marshes have been rising right along with the sea level, duh …
So we have some choices. Either:
a) the scientists don’t realize that the marshes rise with the sea level, or
b) the scientists don’t realize that there has been no sign of the long-predicted acceleration in sea level rise, or
c) the scientists do realize the above, but they don’t mention it because it is off message, with the message being alarmism, or
d) the scientists think the collection of the data is important, which it is, and so they stay schtumm and read their instruments and don’t rock the boat, or
e) ???
Your call,
w.

Reply to  Willis Eschenbach
August 14, 2015 4:07 pm

Yup.

Reply to  Willis Eschenbach
August 14, 2015 5:13 pm

Or, it’s easier to sit in front of a computer, put what-if scenarios into your model, and publish the result, than it is to go out and do the hard gritty real work of science.

Chris Schoneveld
Reply to  Willis Eschenbach
August 16, 2015 5:37 am

They do rise obviously but move laterally inland at the same time.

Ernest Bush
Reply to  Willis Eschenbach
August 16, 2015 8:34 am

I would vote for C without thinking about it. That is the damage Warmists have done to real science. It would not be hard to think of the possibility of two conditions there over the millennia. Salt Marsh and fresh water marsh. That is the history of the south end of San Francisco Bay based on core samples. During the salt marsh times, the Indians had moved out of the forests due to drought and were living in mud huts along the Bay. There are mounds of oyster shells to make it obvious what they were eating for protein. During wet times fresh water plants and mammals abounded to be slowly invaded by salt water species over time during the next drought. It was a constant battle of nature.
Nothing new here and it probably had more to do with the PDO and El Ninos then anything else.

August 14, 2015 12:21 pm

Clearly no one involved in this study passed a class in basic stratigraphy & understands that facies belts / ecosystems will shift laterally with changes in sea level – they don’t go away, this just shift positions laterally. Of course that doesn’t the alarmist meme very well, does it?

Reply to  Jeff L
August 14, 2015 2:47 pm

Some years ago I spent summer weekends kayaking around the Boston harbor islands. There is this long esker of rock debris stretching between Great Brewster island and Lovell’sIsland.Its quite literally at the surface at low tide. 20K years (LGM) earlier the seashore was estimated to be 12-20 miles further out from today’s harbor shoreline. The 300-400 meter high glacier scraping rock beds in central-western Mass and NH left that long pile of rocks as it retreated and seas rapidly rose. Lots of wetlands exist around Boston Harbor and the Cape.

Mark Bofill
August 14, 2015 12:28 pm

100 year threat huh.
How about deficit spending and the projected growth of entitlement programs in the U.S. over the next 20 years? That seems a more imminent and important disaster to me than sea level rise. Anybody think the U.S. can support 40 trillion in debt?

Reply to  Mark Bofill
August 14, 2015 2:53 pm

When the median middle class income rises to about $150k a year. When the Federal reserve and US Treasury get caught in the Fiscal Dominance spiral, they just crank up the printing presses and pay off yesterdays debt with worthless paper in the present. But the effect of that wn’t be pretty on savers, only debtors.

Ric Haldane
August 14, 2015 1:09 pm

Piece of cake. Just use “progressive accounting”. ( Print as you spend).

Leonard Lane
Reply to  Ric Haldane
August 14, 2015 11:03 pm

Or hold the national debt constant for months, but only before elections for progressives.