Claim: Climate Attribution Shows Weather is 1.2x – 9x More Severe Because of CO2

Guest essay by Eric Worrall

With an uncertainty of 900%, weather attribution specialists stand ready to contribute to the conversation about the urgent need for climate action.

Is climate change to blame for extreme weather events? Attribution science says yes, for some – here’s how it works

August 25, 2021 10.28pm AEST
Xubin Zeng
Professor of Atmospheric Sciences and Director of the Climate Dynamics and Hydrometeorolgy Center, University of Arizona

Extreme rainfall and flooding left paths of destruction through communities around the world this summer. The latest was in Tennessee, where preliminary data shows a record-shattering 17 inches of rain fell in 24 hours, turning creeks into rivers that flooded hundreds of homes and killed at least 18 people.

A lot of people are asking: Was it climate change? Answering that question isn’t so simple.

There has always been extreme weather, but human-caused global warming can increase extreme weather’s frequency and severity. For example, research shows that human activities such as burning fossil fuels are unequivocally warming the planet, and we know from basic physics that warm air can hold more moisture.

A decade ago, scientists weren’t able to confidently connect any individual weather event to climate change, even though the broader climate change trends were clear. Today, attribution studies can show whether extreme events were affected by climate change and whether they can be explained by natural variability alone. With rapid advances from research and increasing computing power, extreme event attribution has become a burgeoning new branch of climate science. 

The latest attribution study, released Aug. 23, 2021, looked at the rainfall from the European storm that killed more than 220 people when floods swept through Germany, Belgium, Luxembourg and the Netherlands in July 2021.

A team of climate scientists with the group World Weather Attribution analyzed the record-breaking storm, dubbed Bernd, focusing on two of the most severely affected areas. Their analysis found that human-induced climate change made a storm of that severity between 1.2 and 9 times more likely than it would have been in a world 1.2 degrees Celsius (2.1 F) cooler. The planet has warmed just over 1 C since the industrial era began.

Read more:

How can anyone say with a straight face that attribution science is adding value to the conversation, when the best they can achieve is an uncertainty of 900%, and a bottom limit of no change in severity whatsoever?

The bottom limit of 1.2 times worse seems indistinguishable from business as usual, or even a slight reduction in the severity of weather, with an uncertainty of that magnitude.

I have no problem with people working to understand how CO2, weather and climate change interact. But in my opinion a branch of scientific analysis which apparently cannot distinguish between an unfolding catastrophe and business as usual is way too immature to add any value to the public discussion about climate policy.

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August 25, 2021 6:04 pm

Attribution statistics is NOT SCIENCE it comes from the field of marketing.

Reply to  LdB
August 25, 2021 6:20 pm

These folks are getting desperate. They should instead brush up on their camping and survival skills if they really believe what they’re saying.

Dave Fair
Reply to  LdB
August 25, 2021 8:20 pm

Since the statistics on bad weather hasn’t changed in over 100 years, how can every bad weather event now be attributed to non-existent climate change? Even the UN IPCC CliSciFi reports show no change in bad weather statistics, other than slight warming and dampening.

Matthew Siekierski
Reply to  Dave Fair
August 26, 2021 3:12 am

They tout the increases in deaths and property damage, ignoring the increased populations and more building in flood-prone areas, along with increased property value. So they get to say things like “increasing number of deaths” while the actual death rate from weather events goes down, or “most expensive hurricane ever” based on property value.

By choosing the measuring stick they get to push a particular view of reality that supports their goals.

Reply to  Matthew Siekierski
August 26, 2021 6:26 am

Don’t forget the criminal negligence of the bureaucrats in Germany that did not release water from a damned lake 4-5 days ahead of the storm, even though the forecast was for record breaking rain.

We also had accurate forecasts for a large rain event from tropical storm Fred.

Our near term forecasting, while not perfect (Henri was a dud in Massachusetts) has become very good, even out 5 days out. People would do far better to pay more attention to short term forecasts than worry about the phony gloom and doom climate change predictions which have universally failed so far.

Reply to  LdB
August 25, 2021 11:48 pm

Of course it’s not. It’s numerology. They just do post hoc numerology and that has no prediction power. As such, it’s pseudoscience.

oeman 50
Reply to  LdB
August 26, 2021 6:02 am

Come now, attribution “science” DOES have a sciency formula.

1) Take any recent weather event, hot, cold, hurricane, drought, flood, etc.
2) Label it “extreme.”
3) Do no calculations (because there aren’t any to support the position)
4) Within 1 to 2 days (no longer) call a reporter and attribute it to climate change
5) “Predict” there will be an increasing number of such events up to 2050 and when we will all disappear in a waft of blue steam.

E * n = 2050!!

Rick C
August 25, 2021 6:18 pm

These weather event attribution claims are plain old bogus, junk, pseudo-science at its worst. The so-called World Weather Attribution (WWA) group that got massive coverage over the recent NW US heat wave clearly has a predetermined outcome for any severe weather event – “anthropogenic climate change” did it. Check their website – pure alarmist nonsense. Try and find any weather event that they have “investigated” that they concluded was just natural variability.

There have always been severe weather events somewhere in the world virtually every month. The null hypotheses is that any specific weather event is a normal occurrence within natural variability. What evidence does WWA present to falsify the null hypothesis?

Last edited 26 days ago by Rick C
Reply to  Rick C
August 25, 2021 7:39 pm

Individual weather events are well within the range of normal, nor has their been an increase in frequency.

Reply to  Rick C
August 25, 2021 9:07 pm

I think calling it pseudo-science is an insult to pseudo-scientists 😜

Reply to  Dusty
August 26, 2021 5:43 am

Call it the bullshit it is.

Reply to  Rick C
August 25, 2021 9:41 pm

pseudo-science” how “science” is practiced today. Some of us are having a hard time adapting so the new dynamic.  To me truth should win out, yet all that counts is “feelings”!

Smart Rock
August 25, 2021 6:27 pm

“Welcome to Climate Science™. We know the answers before you pose the questions”

Reply to  Smart Rock
August 25, 2021 9:27 pm

Says it all

My 2 cents on this issue

Chris Hanley
August 25, 2021 6:28 pm

My guess is that if they were of a mind to they could tweak their models to show storms were between 1.2 and 9 times less likely.

Sweet Old Bob
August 25, 2021 6:38 pm

….”and we know from basic physics that warm air can hold more moisture….”

If it HOLDS more moisture then there is less rain …
See how easy it is to twist words ?

Clyde Spencer
Reply to  Sweet Old Bob
August 25, 2021 8:32 pm

Remember griff’s motto: If it can, it will.

Sort of a take off on Murphy’s Law.

Reply to  Clyde Spencer
August 26, 2021 12:52 am

I thought Murphy’s Law says that the probability of an event is inversely proportional to its desirability. Like comments from Griff.

Reply to  decnine
August 26, 2021 6:30 am

I thought Murphy’s law stated that if griff can be wrong, he will be.

Clyde Spencer
Reply to  decnine
August 26, 2021 8:51 pm

No, that is a variation on McGoon’s Law.

August 25, 2021 6:48 pm

A lot of people are asking: Was it climate change? Answering that question isn’t so simple.
I can’t believe he said that. I thought there’s no question, everything bad is caused by climate change.

Reply to  Alan
August 25, 2021 9:11 pm

If it were simple they wouldn’t be able to command the large grant money allocations for their phony-baloney jobs.

Reply to  Alan
August 26, 2021 5:45 am

That was just “the set-up” statement. You KNOW what the answer will be.

Tom Halla
August 25, 2021 6:51 pm

As they are using a rather short climate record, knowing what the actual probability of an event is, is at best speculation. For much of the American West, if one includes paleo reconstructions, one has the possibility of droughts measured in decades. Or for history, a flood that put Sacramento underwater by quite an amount.

J Croder
August 25, 2021 6:51 pm

Does anyone know if this uses the attribution methodology that Ross McKitrick recently published a paper on?

Non-technical summary:

Reply to  J Croder
August 25, 2021 7:07 pm

This group is using exactly what McKitrick was talking about. The organization “World Weather Attribution” is the front/marketing group for this particular effort in alarmism.
This “Attribution Science” thing that just came on the scene with the release of AR 6 seems to be well organized and well coordinated.

I do not think I have seen a branch of science which came with its own marketing group like World Weather Attribution before.

August 25, 2021 6:55 pm

Psychics, astrologers, climate models and voodoo practitioners all claim to predict or cause future events and some are even occasionally somewhat accurate or lucky. Attribution science related to weather is easy by comparison. You can’t prove the conclusions are wrong no matter how unlikely. It is a pathetic and arrogant belief that a connection is there, without any believable or direct line of evidence

Reply to  Rick
August 25, 2021 8:22 pm

Psychics, astrologers, climate models and voodoo practitioners all claim to predict or cause future events”

A climate modelers station…

Reply to  Mike
August 25, 2021 8:39 pm

That modelling station does not look anything like the one I use. My central crystal sphere is very clear, not dirty burnt red as here. I do not know what those green rocks are. They look like some poor second rate jade or some copper containing mineral. No wonder some people get erroneous results with a wretched looking setup like this one.

Reply to  TonyL
August 25, 2021 11:25 pm

” My central crystal sphere is very clear, not dirty burnt red as here.”

That would be the Global warming part. You will notice too that most of it is in the arctic region 🙂

Last edited 26 days ago by Mike
August 25, 2021 7:06 pm

If the indefatigable zealotry of climate change as “official state policy” (not to be denied) is a conversation, then rape is a social event, and sticking up the local gas station is a financial transaction.

Reply to  Capitslist-Dad
August 25, 2021 8:41 pm

I suspect gasoline stations are hit much more frequently.

August 25, 2021 7:21 pm

AR6 SPM highlights 45 land regions of the globe
The claim is
12 regions will have an increase in drought
19 regions will have an increase in heavy precipitation
6 regions will have both.#
20 regions will have neither

My claim – alarmist climate scientists know the above but are committing fraud or at least lying through silence by allowing media to claim extreme events in areas not predicted as being impacted.

In June this year , an intense East Coast Low hit southern Australia causing flooding and damaging winds.
A. AR6 clearly states southern Australia will have more droughts not more floods.
B. Climate science states East Coast Lows should be reduced due to a stronger Sub Tropical Ridge.
Thus this storm event is clear evidence AGAINST CAGW. Climate scientists were lying by silence by allowing media to promote this storm event as being linked to CO2

# the IPCC definition of drought includes evaporation and ground water issues not pure lack of rain hence a place COULD have more drought and more heavy rains, but this is only likely in 6 of the 45 regions of the world

August 25, 2021 7:27 pm

Only 900%? Close enough for government work.

August 25, 2021 7:42 pm

trust me I’m dirty harry
Its true because I tell you
Don’t argue with my 44
It always speaks the truth and wins
You are dead because of climate change

Mark Kaiser
August 25, 2021 8:01 pm

Based on this report, what will our weather look like @ 1,000 ppm CO2? Non-stop storms, hurricanes at 200 mph, 70C heatwaves. It’s just around the corner, we’re at the tipping point.

In fact I just completed my own attribution study based on Eastern Ontario, looking at the month of July. I assure you all, it’s moderate temps, light breezes, and sunny all the way down (OK, except for January and February where we freeze our balls off).

Pat from kerbob
Reply to  Mark Kaiser
August 25, 2021 10:20 pm

Froze your balls off?
Is that why they like Trudeau there?
Enforced femininity?

August 25, 2021 8:02 pm

1.2 times to 9 times….
Funny stuff!

Reply to  Mike
August 25, 2021 8:49 pm

…. and it would be the same if they took CO2 out of their models completely.

How can these people demand to waste their own lives and careers? You only get one life.

Doc Chuck
Reply to  philincalifornia
August 25, 2021 10:24 pm

Phil, imagine the dreary lives these drones are fleeing from by any beguiling means at hand. Even modest ill-gotten gains from proclaiming unfalsifiable tipping points best a lifelong miasma of serial pukings and bouncings from tippling joints.

Willem post
August 25, 2021 8:03 pm

Gee, I was involved in the design and construction of an 1800 MW, coal-fired power plant in New Roads, Louisiana, in the mid 70s

We designed gutters and downspouts and below ground rain sewers for downpours of SEVEN INCHES PER HOUR

That was well before the “warming climate” hysteria.

Reply to  Willem post
August 25, 2021 8:44 pm

Louisiana IS closer to the source.

August 25, 2021 8:09 pm

Weather event attribution has all the rigor of my assignments of my excess flatulence episodes.

I never want to attribute my windiness to the stuff I love to eat and drink (bbq ribs & beer) – it’s always something like that kale salad my neighbor brought to lunch.

But unlike the weather attribution “scientists”, at least I know and admit when I’m bullsh1tting.

Last edited 26 days ago by Mr.
Reply to  Mr.
August 26, 2021 6:06 am

I’m thinking the causes of excess flatulence have better predictability than climate attribution….digestive science and all….

Andrew Wilkins
Reply to  Mr.
August 26, 2021 9:41 am

But do you admit when you’re sh1tting?

August 25, 2021 8:25 pm

Climate Attribution and Alarmism is 1.2x – 9x More Severe Because of Funding, Grants, Sponsorship and Support from Climate Change Central Orgaisation.

Gerald Machnee
August 25, 2021 8:33 pm

They could have said 20 to 30 times. It means the same thing – fiction.

Gerald Machnee
August 25, 2021 8:34 pm

Attribution is another religious sect like the climate change fearmongers.

Reply to  Gerald Machnee
August 25, 2021 8:52 pm

It’s a new word theft from the libtardians. “Existential” appears to have run its course, although Biden used it a few days ago. He’s a bit slow. Give it about 3 weeks and we’ll have some Afghan attribution.

August 25, 2021 9:03 pm

I’d like to know what severity means in scientific terms. I’d also like to know if proper management of the flood mitigation dam network would alter the “severity” of the floods.

There’s more I’d like for them to explain but that would make for a good start.

Dennis Stayer
August 25, 2021 9:41 pm

They say it because they believe large governmental grants will follow!

August 25, 2021 11:14 pm

So it could be 9x less extreme. Hmmmm…

Ian MacCulloch
August 25, 2021 11:19 pm

Finally, it is about time the journalist class starting looking behind the noise. All climate warming claims are based on a primary falsehood and that is the start date. It is no coincidence the start dates of 1750, 1830, 1910 (BOM/CSIRO) Australia start date and 1975 (Roy Spencer who I admire and who maintains global warming at 0.14C/decade from his tropospheric calculations commencing 1978) all start their stories at time of cyclical global temperature lows. This propagates the myth of global warming as a man made event caused by increasing CO2 levels.. It is just blatant stupidity to want to return to the dark ages of the pre-industrial revolution when it was cold wet and icy, disease ridden, famines aplenty all combining to give high mortality rates. Any study of palaeoclimatology will show the cyclical nature of the Earth’s climate using a variety of protocols. To insist on carbon reduction goes against the real science of palaoeclimatology.

August 25, 2021 11:47 pm

I have actually read some of the attribution studies, as usual the studies are based on previous study models which have the wide uncertainty range.

The approach is to rush out an early analysis soon after event, this is usually based on very little real information and often is just model data. The headline climate emergency is proved.

Then when better data arrives the study is revised and the uncertainty band will now include no observable trend.

Rory Forbes
August 25, 2021 11:48 pm

Do these people really believe anyone with a brain would believe such utter balderdash? They’re just making it up and pretending there is some mystical statistics and science involved. It’s flim-flam dressed up to fool the punters. No one with any sort of science background can possibly take such absurdities seriously.

August 26, 2021 12:37 am

As soon as a computer model of the climate is used you know 100% sure that the conclusion depend to 100% on what was “assumed” before running the calculation.

August 26, 2021 12:44 am

As Lindzen has pointed out for years, physics suggests in a warming world the poles will warm significantly and the equatorial region will warm very little. The equatorial to polar temperature gradient will therefore reduce. As its the gradient that drives weather the expectation is that severe weather will reduce, not increase, in a warming world.

In a warming world everything gets worse? This is so unlikely as to be absurd. And as Lindzen has also pointed out, in science adjustment and updating of measured datasets over time is quite normal. What is not normal is how, in climate science, all the adjustments are always in the same direction – increasing warmth now and cooling the past.

Feynman must be turning in his grave. Climate scientists appear to ignore everything he said.

Last edited 26 days ago by ThinkingScientist
August 26, 2021 12:53 am

No matter how much they claim otherwise, the climate alarmist narrative is built on – and can never extricate itself from – the imbecilic notion of Edenic stasis. That the climate never changed before 1850. Belief in Edenic stasis of climate and now of even weather is more stupid than belief in a flat earth.

Though they claim to believe in past climate change, including of glacial cycles, with every revision of past reconstructed climate the temperature timeline gets a little bit smoother, and smoother, and smoother. Until they are back in the reassuring myth of the garden of Eden. Pristine before carbon sin.

August 26, 2021 1:09 am

I have no problem with people working to understand how CO2, weather and climate change interact. 

If all the work was unpaid or paid for by benefactors not feeding from a government trough then I would agree with you.

Using government funds to produce this attribution tripe is evil.

Climate believer
August 26, 2021 2:10 am

“Identifying a human fingerprint on individual extreme weather events —“probabilistic extreme event attribution” — has been an important goal of the scientific community for more than a decade.”

No sh@t sherlock….

Michael in Dublin
August 26, 2021 2:26 am

George Orwell railed against the use of adjectives. This may have been prompted more by their abuse than use. I wonder what he would have made of the favorite words used today by climate activists. Climate activists, now that is an interesting phrase that correctly portrays their endeavours as ludicrous. When discussing climate we face a problem both of bad science and bad language – i.e. badly used or shoddy. What follows is a comment I made elsewhere that is applicable here:

The word “extreme” used with weather is a misnomer. It incorrectly divides weather into two categories, normal and extreme. However, weather includes all sorts of conditions, hot and cold, wet and dry, windy and still and so on. Nor should we speak of extreme climates.

There are some thirty climate zones and sub-zones. In each of these we find a range of weather conditions. What is normal in each of these is different from the others. Further, normal does not mean the average which is misleading but what people expect like winter rain in a Mediterranean area.

For an intelligent conversation about climate and weather we need to carefully use language and accurately define the terms we use. Climate alarmists are often characterized by shoddy language, a lack of cogent arguments and resorting to ad hominems.

Last edited 26 days ago by Michael in Dublin
August 26, 2021 2:34 am

I’ll post it again, just cos it’s fun.

This is the calculation. It’s basic Arithmetic, nothing fancy, no hidden agenda, just something you can do by taking your socks and shoes off.
Atmospheric CO2 levels in 1850 (beginning of the Industrial Revolution): ~280ppm (parts per million atmospheric content).
Atmospheric CO2 level in 2021: ~410ppm.
410ppm minus 280ppm = 130ppm ÷ 171 years (2021 minus 1850) = 0.76ppm of which man is responsible for ~3% = ~0.02ppm.
That’s every human on the planet and every industrial process adding ~0.02ppm CO2 to the atmosphere per year on average. At that rate mankind’s CO2 contribution would take more than 20,000 years to double which, the IPCC states, would cause around 2°C of temperature rise. That’s ~0.0001°C increase per year for 20,000 years.
One hundred (100) generations from now (assuming ~ 25 years per generation) would experience warming of ~0.25°C more than we have today. ‘The children’ are not threatened!
Furthermore, the Manua Loa CO2 observatory (and others) can identify and illustrate Natures small seasonal variations in atmospheric CO2 but cannot distinguish between natural and manmade atmospheric CO2.
Hardly surprising, mankind’s CO2 emissions are so inconsequential this ‘vital component’ of Global Warming can’t be illustrated on the regularly updated Manua Loa graph.
It’s independent of seasonal variation and would reveal itself as a straight line, so should be obvious.
Not even the global fall in manmade CO2 over the early Covid-19 pandemic, estimated at ~14% (14% of ~0.02ppm CO2 = 0.0028ppm), registers anywhere on the Manua Loa data.
Why am I not surprised?!

Joao Martins
August 26, 2021 3:21 am

Wrong title. Should be:

“Claim: Weather Shows Climate Attribution is 1.2x – 9x More Severe Because of CO2”

August 26, 2021 4:11 am

The FIRST QUESTION MUST BE: Has this happened before and how often? ONLY then can one logically proceed.

August 26, 2021 4:36 am

Sounds like a whole bunch of not predicted outcomes looking for an explanation

Laws of Nature
August 26, 2021 5:00 am

Well, my problem with this kind of studies stems from the fact that the basic model they use typically is a high CO2 sensitivity CMIP. So it seems there is a missing uncertainty right from the start which is not properly discussed.
In other word they find some behavior in simulations which do not necessary describe the real world, in fact we know that such models fail verification tests.

Tom Abbott
August 26, 2021 5:18 am

From the article: “weather attribution specialists”


Tom Abbott
Reply to  Tom Abbott
August 27, 2021 5:06 am

Griff is a weather attribution specialist. He sees CO2 in just about everything.

I wonder how one specializes in weather attribution, when there is nothing factual on which to base such weather attributions?

I guess all such weather attributors must be True Believers in CAGW (Catastrophic Anthropogenic Global Warming), because they are not making fact-based assessments

The CAGW promoters have a high confidence in their opinions.

I have no confidence in their opinions.

Tom Abbott
August 26, 2021 5:25 am

From the article: “There has always been extreme weather, but human-caused global warming can increase extreme weather’s frequency and severity. For example, research shows that human activities such as burning fossil fuels are unequivocally warming the planet,”

The planet is currently cooling, 0.5C since 2016, and we are still burning fossil fuels, so how do you square that with your claim?

On top of that, what evidence do you have that CO2 is warming the planet? CO2 may not be net warming the atmosphere at all, it may be net cooling the atmosphere, and the person making the assertions above can’t prove it one way or another right now. Yet he seems so sure of himself. True Believers are the bane of science.

Tom Abbott
August 26, 2021 5:37 am

From the article: “Their analysis found that human-induced climate change made a storm of that severity between 1.2 and 9 times more likely than it would have been in a world 1.2 degrees Celsius (2.1 F) cooler. The planet has warmed just over 1 C since the industrial era began.”

If that’s the case, then the planet has cooled 0.5C since it warmed to “over 1C, so we are sitting at 0.5C above the baseline, not 1.0C. These guys can’t even get their figures right. They are probably looking at the wrong temperature chart.

Here’s the temperature chart they should be looking at:

The UAH satellite chart:

comment image

These alarmists seem to think the planet is stuck at the high temperature of 2016. That’s not the case. As you can see, the temperatures have cooled considerably since 2016, yet the alarmists are still living in 2016. Their thought processes are flawed. Probably because they look at bogus, bastardized temperature charts and think they are real, instead of looking at the real world represented by the UAH satellite chart.

August 26, 2021 5:45 am

“A lot of people are asking: Was it climate change? Answering that question isn’t so simple.” – Xibom Zeng

No, Big Guy, It is freakin’ summer weather and excessive rainfall with flooding is NOT unusual anywhere at all, including wherever you come from.

That’s all it is, pal: W-E-A-T-H-E-R. You’ll just have to deal with that like the rest of us do, and make sure your house is above the flood plain, because – in case you hadn’t noticed – none of those houses damaged in that Tennessee flood were above the flood plain. And if the rivers that get a high volume of water overflow their banks, it has to go somewhere, like right into your basement.

I can’t figure out why that’s so hard to understand…. What did I miss?

Last edited 26 days ago by Sara
August 26, 2021 5:51 am

I say 0 to 100x. Where’s my taxpayer-funded check? With a range like that how do you plan? You will be 1.2 to 9 times as dead.

Gerry, England
August 26, 2021 6:09 am

Would World Weather Attribution have a vested interest in attribution studies finding a link between human CO2 and extreme weather? If there is no attribution link they might have to go and find proper jobs, maybe even producing something of use.

Ulric Lyons
August 26, 2021 6:36 am

“For example, research shows that human activities such as burning fossil fuels are unequivocally warming the planet, and we know from basic physics that warm air can hold more moisture.”

But changes in water vapour are dominated by the ocean phases which are warmer when the solar wind is weaker, like with the AMO since 1995. Surface wind speeds over the oceans have also increased since 1995.

The IPCC and Met Office circulation models predict drier summers for Northwest Europe with rising CO2 forcing, due to a modeled positive influence on the North Atlantic Oscillation, which is exactly what stronger solar wind states do. But the summers have on average become wetter since 1995. The only excuse they have for this disparity is the warm AMO phase since 1995, hence the urgency to make it look like the warm AMO is Mann made, as opposed to being normal during a centennial solar minimum.

Other anti-science weather attribution from Friederike Otto includes the hot Saharan plumes of summer 2019 in NW Europe, which were totally dependent on strongly negative North Atlantic Oscillation conditions for the plumes to manifest, and so are predictably more common during centennial solar minima. There are several examples in the 1880-1890’s. Again, the negative NAO is the complete reverse of what all the circulation models predict with rising CO2 forcing. Yet her science fiction is being used in climate litigation cases.

John Dueker
August 26, 2021 8:02 am

This analysis says most attribution studies use invalid statistical methods.

I wonder what the 900% uncertainty climbs to if proper methods are used.

August 26, 2021 8:48 am

It’s water This has to be a joke. Possible to be accurate and not precise and vice versa…
A lot of people are asking was it climate change! Doubtful people’s homes that are flooded are asking is it climate change. More likely concerned about recovery and flood control.

John Sandhofner
August 26, 2021 1:07 pm

“Today, attribution studies can show whether extreme events were affected by climate change and whether they can be explained by natural variability alone. With rapid advances from research and increasing computing power, extreme event attribution has become a burgeoning new branch of climate science.” They figure more powerful computers give better modeling results. But, at it’s heart, it is still nothing more than modeling. More powerful computing of “garbage in” just means faster “garbage out” results. Their faith in modeling is where they miss the mark.

To bed B
August 26, 2021 5:05 pm

Climate scientists are 95% certain these days, although they still report global temperatures with a 1 SD error estimate.

August 26, 2021 6:41 pm

Unfortunately I spent a while as a university control theory tutor.

In a linear system, the frequency of any output is matched by the frequency of any input.

The increase of CO2 is an extremely gradual low frequency change, components having a period of decades.

Storms and disasters and such have exceedingly high frequency components in comparison; weeks, days, and hours.

So I wonder what the non-linear physical mechanism is that can amplify such a low frequency input to such high frequency outputs, and that is immune to diurnal and seasonal variations. Must be some incredible non-linear amplification happening.

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