Reposted from Judith Curry’s Climate Etc.
by Judith Curry
There is a disturbing story coming out of the University of Washington surrounding Cliff Mass.
In preparing this article, I have received material from a member of the Department of Atmospheric Sciences at the University of Washington. I also ran into another member of the Department while at the AGU meeting this week, who corroborated these events. I conducted a 30 minute phone interview with Cliff Mass.
Who is Cliff Mass?
Cliff Mass has been a faculty member in the University of Washington Atmospheric Sciences Department since 1982. His research focuses on numerical weather modeling and prediction, the role of topography in the evolution of weather systems, and on the weather of the Pacific Northwest. In addition to his research publications, Cliff Mass has published a popular book entitled ‘Weather of the Pacific Northwest.’
Since 2008, Cliff Mass has maintained a popular blog Cliff Mass Weather and Climate. Mass posts regular articles on meteorology, Pacific Northwest weather history, and the impacts of climate change written for the general public.
He has 13,000 twitter followers. Mass also has a weekly radio show with 400,000 weekly listeners (!)
Cliff Mass – climate ‘denier’?
Cliff Mass has been characterized as a ‘sort of’ climate denier. The first reference to this is a 2015 article Cliff Mass: Scientific lies and the new climate deniers.
“He is also a dangerous new breed of climate skeptic. He has made a theme of downplaying the role of global warming in extreme weather events, and in exposing what he calls “overzealousness” in the scientific, media, and activist community.”
A 2017 article in Stranger entitled Why does Cliff Mass believe scientists and leftist journalists are exaggerating the dangers of climate change?
“Cliff Mass is not a climate denier, but he is their ally, which is as good as being a climate denier.”
The accusation of ‘denier’ got more explicit when Sarah Myre testified before the State of Washington House of Representatives: Can you be a climate scientist and an advocate?
“In February 2017, Sarah Myhre traveled to Washington’s capital, Olympia, to give testimony to the state House of Representatives Environment Committee. There, Representative Shelly Short, a Republican from northeastern Washington, asked her to comment on her colleague Mass’ unwillingness to link recent wildfires, droughts, and hurricanes to climate change. Myhre responded that she and many of her colleagues saw Mass’ recent views “as coming from a denialist or contrarian place.”
The Cascadia Daily states:
“Seattle weather guy and climate change denier Cliff Mass”
So, what does Cliff Mass have to say about climate change, in his own words? From an interview with the UW Alumni magazine and summary from the Wikipedia (based on my knowledge of Cliff’s opinions and writings, this is correct):
“According to Mass, “Global warming is an extraordinarily serious issue, and scientists have a key role to play in communicating what is known and what is not about this critical issue.
Mass has stated publicly that he shares the scientific consensus that global warming is real and that human activity is the primary cause of warming trends in the 20th and 21st centuries. He has been critical of the Paris Climate accord for not going far enough to address the negative impacts of climate change. However, Mass is also frequently critical of what he has characterizes as exaggerations of the past and current impacts of climate change in the news media, including the attribution of individual extreme weather events to global warming.”
The most recent ‘denier’ claims are associated with Cliff’s statements about the causes of the recent California fires: Cliff Mass: Climate change is real but . . .
“But Mass takes issue every time someone points to local extreme weather and says “that’s caused by climate change.”
The extremes we’ve seen in Seattle, around the region and even across the U.S. — most of them anyway — are caused by anomalous weather patterns, not climate change, Mass said.
There are, of course, those who would argue that by nitpicking such details, Mass only feeds ammunition to climate change deniers. Mass doesn’t want to downplay global warming; he just doesn’t want to stretch the truth to try and out-extreme those who would deny it. “So global warming’s very serious,” Mass said. “But it’s coming up in the future, not right now, for us.”
Sarah Myhre is not happy with Mass’ recent statements about the California wildfires. From an article by James Delingpole: Brown Fiddled While California Burned:
“One Dr Sarah Myhre – who, gloriously, bills herself as a “public scholar scientist advocate communicator” [actually, you know, just “activist” would have done] – tweeted at him “This. Is. Pure. Propaganda.” And then told a Washington radio station that had given him airtime that giving Cliff a “platform” was a “form of violence.”
So in summary, Cliff Mass accepts the consensus science. However he breaks with the ‘activists’ in terms of thinking it is a bad idea to falsely claim that extreme weather events are caused by AGW.
Initiative-1631
Most unforgivably, Mass broke with the progressive activists in terms of not supporting the latest carbon fee initiative in Washington, I-1631. Mass has long advocated for some sort of carbon tax: How to make a carbon tax work in Washington
Mass was a strong supporter of a previous carbon tax initiative (which was voted down). His concerns with I-1631 are described in three blog posts:
- If you worry about climate change and care about the environment, vote no on I-1631.
- Initiative I-1631: At odds with democratic values
- A Political analysis of I-1631: The carbon fee initiative
I don’t pretend to be an expert on I-1631 and I am not passing judgment here, but I will say that Mass’s position is well-supported and defensible.
For a perspective from the supporters of I-1631, I refer to Sarah Myhre’s article in the Stranger entitled New carbon tax initiative drafted with more color and less white supremacy. Reducing CO2 emissions seems to be a relatively minor factor; climate policy has become a crusade to change the balance of power:
“When climate policy is written by white men in a closed room, that is white supremacy.”
Things got really ‘interesting’ as a result Mass’ blog post ‘If you worry about climate change . . .’ , which had this statement:
“The initiative hardwires money to certain special interest groups–the left-leaning supporters of the measure. A minimum of ten percent of the money goes to Indian tribes, who are exempted from paying any carbon fee by the initiative. Labor advocates got a fifty million dollar fund, replenished annually, for worker support programs. And to provide funding to the social action groups pushing the initiative, 35% of the money goes to “pollution and health action areas” of minority and “vulnerable populations.” There is more, but you get the message (see the picture below).” [The picture was pigs at a trough.]
Mass’ point was that special interest groups were hardwired for a good portion of the funds. He wanted an image that illustrated ‘political pork’ and special interest groups feeding at the public trough and so he used the pigs at a trough image.
While there were no complaints about the image in the blog comments, a few of the activists at the UW claimed it was racist. Imagery of pigs at a public trough has been used for over a century, and has never been used to refer to minorities as far as Mass could identify. ‘Pigs at a trough’ is about the well-connected and privileged. Mass decided to be sensitive to the ‘feelings’ of thee activists and pulled the image. Then Mass received a number of messages after he pulled it, accusing him of giving in to mob rule. There was nothing racist or anything else inappropriate in the text, and no one has suggested there was. Apparently the mention of the phrase ‘Indian tribes’ in the same paragraph that references an image of pigs at the trough is sufficient to trigger an accusation of racism.
Note: I-1631 was voted down in the November election.
Department of Atmospheric Sciences
Any scientist that is active in the public debate on climate change (no matter what their actual position in the debate) will invariably be subject to attacks on twitter, the blogosphere and even by journalists. That is part of the noise associated with the public debate on climate change. This noise shouldn’t matter, in the overall scheme of things.
However, it is a different kettle of fish when people from your own university, and even your own Department, go after you publicly, with the objective of stifling your freedom of speech. And then when University administrators get involved, a threatening situation can emerge.
A number of University of Washington graduate students have taken a vocal stance against Cliff Mass, particularly on twitter. These same activist students that were so upset about the pig picture participated in online character assassination, calling Mass every name in the book over the past six months because they are unhappy with his rejection of 1631 and his research/blog posts on wildfires and attribution of extreme events. They have accused him of deception, being on the payroll of oil companies, purposely obfuscating with multiple twitter accounts, racism, misogyny, tokenism, Trumpism. They are hypersensitive about any indirect criticism of their ‘side’ but are fine with name-calling and personal attacks on those they disagree with.
The attacks ramped up when a group of students complained to the Assistant Dean for Diversity, Equity and Inclusion. Rather than meet with Cliff Mass to discuss, the Assistant Dean sent a mass email to the faculty of the Atmospheric Sciences Department, with the following lede:
“a recent blog posting by a member of our community on a personal website included imagery and text that was racially insensitive and caused offense to a significant number of members in the departmental community.”
No attempt was made by this Assistant Dean to meet with Cliff Mass, or to understand that there was no racism evident or intended, and that the image in question was quickly removed from the blog post.
I will not ‘name and shame’ any of the graduate students here, who in any event are probably proud of their behavior. (JC note to students applying for jobs: search committees will check your social media presence). However, one graduate student in particular gets a ‘dishonorable’ mention here: Alex Lenferna, a Ph.D. candidate in the UW Philosophy Department with a Certificate in Atmospheric Science. He wrote a blog post that is basically a ‘hit-job’ on Cliff Mass, owing to his failure to support I-1631, including playing the ‘racism’ card. The blog post includes an image: Cliff Mass ‘hearts’ oil.
I won’t dignify Lenferna’s slime by reproducing any of it. This blog post is significant, however, because the Atmospheric Sciences Department Chair (Dale Durran) sent a mass email to the Department faculty including the link to Lenferna’s post, and voicing concern about Mass’ behavior and ‘racism’, and including the image Mass ‘hearts’ oil.
The Chair then called a general Department-wide meeting about the blog post Mass wrote, with the event billed as ‘controversy.’ An ombudsperson was enlisted to run the meeting, but the Chair took over, serving as inquisitor and critic. The Chair prevented Mass from finishing his opening comments and hectored Mass throughout the meeting. The activist students were true to form, hurling all kinds of insulting, personal and inappropriate remarks.
So what is going on here? Is the Department of Atmospheric Sciences making a stand against political activism by its faculty members? Hardly. In fact, the Chair, Dale Durran, pressured each of the faculty members to sign a statement supporting I-1631. This statement was published by the Seattle Times :
“Some know they must stop smoking, but can’t, and it wrecks their health. As spelled out in the recent Intergovernmental Panel on Climate Change report, humanity has been acting like a chain smoker. Initiative 1631 gives us the chance to change. The opposition to I-1631 is largely concerned with the politics of taxing and spending. These are important matters, but they should not be endlessly debated in lieu of taking action. I-1631 is the third major effort to discourage carbon emissions in Washington state.
Science shows carbon emissions remain in the atmosphere for hundreds to thousands of years, warming and dramatically changing the climate. Because of the way carbon accumulates, the emission reductions required to hold future changes in climate below any given level become more drastic with each year we wait to begin serious cuts.
Unlike the carbon emitted while waiting for a perfect law, passing I-1631 does not represent an irrevocable hundreds-of-years commitment. After a short period, I-1631 could be amended to make it even better.
Now is the time to take a big step to kick our carbon habit.
Dale Durran, professor and chair, and 21 other professors in the Atmospheric Sciences Department at the University of Washington, Seattle (the views expressed here are those of the authors and not UW)”
While many of the faculty members appear to have signed this enthusiastically (based on their signatures on other lists related to I-1631), I’ve been told that several faculty members felt uncomfortable signing this. One of the faculty members I spoke with said they felt compelled to sign the letter since they didn’t want to stand up to Chair; this individual told me they voted against I-1631.
There are several people in the Department of Atmospheric Sciences that don’t like Cliff Mass (including, obviously, the Chair). They are concerned about his status as Washington’s ‘celebrity’ scientist – being either envious of this status or concerned that this status makes Mass relatively immune to ‘pressure’ from Departmental leadership. But most fundamentally, they seem to dislike that his blog is getting in the way of their own political advocacy.
JC reflections
The climate change advocacy disease seems to have affected many of the UW faculty and graduate students. Apart from the issue of activism potentially getting in the way of scientific objectivity, the big issue here is that the Chair attempted to ‘institutionalize’ this activism with the I-1631 support letter. I have to say I find this very inappropriate behavior for a Chair, and I’m surprised that the higher administration didn’t reprimand him for this (in the old days I would have been reprimanded for this at Georgia Tech, but under the current administration, who knows). Faculty members were pressured into signing that letter, since the Chair controls their reappointments and promotions, salary, teaching assignments, etc. The public ‘shaming’ meeting is beyond the pale, particularly the Chair’s behavior during this meeting. After this behavior, I cannot imagine how the UW faculty and administration can have any confidence in the leadership of their current Chair.
And finally, a closing comment about Cliff Mass. While this can’t be fun for him, I’m not too worried about Cliff Mass: Cliff has friends in high places and an enormous ‘bully pulpit’ in terms of his blog and radio show. Trying to take him down isn’t going to work.
I have much more to say on this situation and the broader implications, I will write more in a follow on post.
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“For a perspective from the supporters of I-1631, I refer to Sarah Myhre’s article in the Stranger entitled New carbon tax initiative drafted with more color and less white supremacy.”
I’m beginning to see where this woman is coming from. She considers White Supremacy to be problem and wants to incorporate this delusion into climate science, and every other aspect of her life, no doubt. In other words, she is a typical radical leftists/socialist racist.
I have been reading Cliff Mass’s blog for about 5 years now, if anything, I’d consider him a bit (just a bit) of an alarmist.
That said, he always presents the facts, usually with a precautionary theme.
I still read him.
“According to Mass, “Global warming is an extraordinarily serious issue, and scientists have a key role to play in communicating what is known and what is not about this critical issue.”…”
I strongly disagree with Cliff Mass. I suggest that:
“Global warming is an extraordinarily serious FRAUD, in which trillions of dollars of scarce global resources have been misappropriated by scoundrels and imbeciles.
As a UW grad, I am outraged at this assault on academic freedom! I have always taken for granted that a university is a place where open exchange of ideas and debate was encouraged, not suppressed. I’ve disagreed with him many times, but this blatant attack to shut him up is a complete violation of university academic freedom. An attach on his academic freedom is an attack of the academic freedom of all of us and cannot be tolerated.
I went thru a similar (but less virulent) situation at Western Washington university for just presenting data to a Senate hearing. I was pleasantly surprised when the scientific community from all over the world came to my defense and bombarded the university administration with hundreds of emails from all over the world. That’s what needs to be done here. If you read this, send an email of protest to the UW president, provost, and dean.
From the article: “Science shows carbon emissions remain in the atmosphere for hundreds to thousands of years, warming and dramatically changing the climate.”
Science shows no such thing.
Is this what they teach at Washington University?
Why don’t you accept this:
“Science shows carbon emissions remain in the atmosphere for hundreds to thousands of years, warming and dramatically changing the climate.”
Are you in denial of the drastically-elevated drama levels in the atmosphere lately, or is your objection more to do with our ability to precisely measure drasticity? Are you unaware of the recent developments in Drama Studies by people working on this precise, or imprecise as the case may be, problem?
Stick your head in the sand all you like, but it won’t change the hard scientific facts on the icy ground: that traditional Inuit knowledge-holders are telling us they’ve never seen such drama in their entire cultural memory. It’s getting so dramatic, they’re less and less willing to even talk about it with oral historians, who are increasingly having to resort to confabulating their testimony.
That’s how drastic the science is.
“Are you in denial of the drastically-elevated drama levels in the atmosphere lately,”
I *am* aware of the drama levels on the alarmist side. I’m just trying to calm these people down using a little truth and common sense.
You are definitely correct: It’s getting drastic out there. Alarmists are losing the battle and are flailing around in all directions with their mindless fearmongering..
Not only at UW but everywhere is this bit of nonsense and other like it taught. Not only at the university level but at all levels right down to elementary education levels, to kids who can’t yet possibly think critically on such complex and multidisciplinary topics. It is a very wicked systemic problem we face. Free speech and academic freedom are probably the only checks.
“It is a very wicked systemic problem we face. Free speech and academic freedom are probably the only checks.”
I agree completely.
“giving Cliff a “platform” was a “form of violence.” Liberals use of hyperbole wears thin, especially when that is all they have for an arguement. Over and over they throw these statements that are ridiculous.
One fragment of JC’s post doesn’t make sense:
“So in summary, Cliff Mass accepts the consensus science. ”
Mass thinks climate change is a serious threat—a position the majority of scientists don’t share, as far as anyone can tell.
Otherwise a timely and disturbing article. Well done Judith (and Anthony).
This is the kind of behavior that gives academia, liberals and AGW “believers” a bad name. It’s so dumb. Counterproductive. Immature. Nevertheless, one has to wonder whether there is more to it, some kind of personal conflict or something – it’s important to realize, I think, that we’ve only heard one side of the story. Not that it excuses idiotic attacks.
But there are plenty idiotic attacks by skeptics, too, if not on individuals, then on groups.
I think some people on WUWT should heed Mass’s words:
“Science can only flourish when there is tolerance for a diversity of viewpoints and ideas. Name calling and politicization of science are toxic to the scientific enterprise, and undermines our credibility in the general community.”
Couldn’t agree more.
“one has to wonder whether there is more to it, some kind of personal conflict or something”
Myhre (sp?) had a run-in with either Mass or another skeptic professor, as mentioned in her Stranger article.
Kristi,
You are to be commended for at least giving lip service to the ideas of freedom and integrity.
I suggest you try to post these ideas over at one of the consensus supporting blogs and report back on the reactions and treatment you experience.
Heretics, or perceived heretics, often receive harsher treatment from the faithful than infidels do, and climatists seem no different in this respect.
When a debate on any matter becomes emotional and accepted positions are polarised, then no-one want to listen to reasoned argument from someone with a moderate position. Left or Right — it matters not. People have always been like this. Just as we look with righteous dismay at the follies of our ancestors, so future generations will view some of our antics — even as they indulge in their own foolishness.
What is most disappointing is that denizens of the institutions of higher learning, supposedly bastions of intellectual freedom, are just as susceptible to this brutal groupthink as lesser mortals. It seems likely that Napoleon (not a noted philosopher) nailed it when he observed: “Men are moved by two levers only: fear and self-interest.”
I don’t know why anyone with knowledge of the left could be surprised by this sort of thing.
I am personally acquainted with a young man, (can I say that) who just graduated from W. State.
His degree is in international finance.
He believe socialism is better than capitalism.
How in the world can we win against stuff like that?
Jack
That young man needs to take a trip to Venezuela.
Or he could google socialism and do a little study and he would realize that socialism never works. Unfortunately, a lot of people don’t like questioning their own world view and don’t look too deeply into the narratives they believe in.
The good news is many human beings have the ability to filter out the wheat from the chaff, even when they are in a blizzard of chaff. That’s why we have Trump as president.
The bad news is almost an equal number of people in the U.S. can’t separate the wheat from the chaff, and their confusion is exascerbated by the leftwing propaganda constrantly put out by the Leftwing Media, and then they end up voting for the wrong person and harming the nation as a result.
” His concerns with I-1631 are described in three blog posts:” (listed in the text body)
It doesn’t list his first I-1631 posting:
“The Carbon Fee Initiative (1631) Has Major Problems: Let’s Try Something Better”
http://cliffmass.blogspot.com/2018/04/the-carbon-fee-initiative-1631-has.html
He also has a fifth posting on I-1631:
“Lessons of the Failure of Initiative 1631, the Washington State Carbon Fee, Part 1: Election Analysis”
http://cliffmass.blogspot.com/2018/12/lessons-of-failure-of-initiative-1631.html
The “Part 1” suggests he is not done yet.
His analysis is very good. It could surprise you.
He as even more postings on the subject of carbon taxes and how to do them right. For example,
“Moving Forward with a Carbon Tax in Washington State: Only A Revenue-Neutral Approach is Viable (Part I)”
http://cliffmass.blogspot.com/2018/03/moving-forward-with-carbon-tax-in.html
There is no question that he believes in global warming and carbon taxes. Even smart people can be wrong; there’s no accounting for it. On the plus side, he is against the alarmist hype. If only because it reduces the effectiveness of the activism against global warming. I’d love to see him in a debate about it in this forum.
“He as even more postings on the subject of carbon taxes and how to do them right”
The only way to do them “right” is to not do them at all. It’s a completely useless exercise, unless you just want to suck money out of people and corporations for no good reason.
No surprise , religious fanatics are often been harder on those that ‘believe in the wrong way’ than those that don’t believe at all. Its was after all ‘heretics ‘ that most often got burned at the stake for the ‘crime ‘ of challenging the purity of the faith .
To:
George Sandison, Chair of the Faculty Senate
University of Washington
George Sandison
Faculty senate chair
Telephone: 206-685-2703
Email: sandison@uw.edu
Personal Profile:
http://www.washington.edu/news/2018/10/18/new-faculty-chair-george-sandison-outlines-his-priorities/
CLIFF MASS: VICTIM OF ACADEMIC POLITICAL BULLYING
https://wattsupwiththat.com/2018/12/13/cliff-mass-victim-of-academic-political-bullying/
Dear Sir:
Please read the aforementioned article re the alleged academic political bullying of Cliff Mass by other members of the faculty of your university.
I do not share the concerns of Cliff Mass on the subject of alleged Catastrophic Human-made Global Warming, but I am astonished and offended that your university would tolerate the abuse of Mass’s right to free speech by extremists, including members of your faculty.
I understand you are a physicist, and thus are familiar with the Scientific Method. The extremist views of those parties criticizing Mass (regarding wilder weather, etc.) are not supported by credible scientific evidence. Neither are Mass’s concerns about Catastrophic Human-made Global Warming, for that matter, but it is his unalienable right to state his opinions without the persecution that he has been subjected to.
There is overwhelming evidence that the impacts of increasing atmospheric CO2 will result at most in some moderate, net-beneficial global warming, along with a hugely beneficial increase in plant and crop yields. That is the mainstream view of so-called “climate skeptics”.
The scientific situation is more complicated than that, since atmospheric CO2 trends lag temperature trends at all measured time scales, and most people will agree that the future cannot cause the past (in our current space-time continuum). That issue is too complicated for the current discussion.
I suggest that you must re-establish the right to Freedom of Speech on your campus, or surrender your institutional integrity to the ill-informed extremists in your midst.
Yours truly, Allan MacRae, P.Eng.
Calgary
Another example of how climate consensus obsession leads to a severe reduction in rational thought processes, critical thinking and ethics.
Each of those reactionary faux students in the Lynch mob attacking Prof. Moss should be blacklisted from ever teaching it receiving grants.
As if.
🙄
But the Dept. Head is the most egregious of them all, attacking a colleague and denying them the right to even speak.
The PC enforcer, slimy as they were, us merely doing what denizens under rocks do.
Moss is finding out that he is practicing rational ethical behavior in a post rational, post ethical world.
If he sues, I will contribute to the fund.
JC says:
The climate change advocacy disease
Add “mental” in front of disease & she’s got it right.
Leftists are free to be horrible people and yell all they want, but it is not ok for a Dean or Dept head to a) force a dept to all sign a political petition or b) conduct a public struggle session against a faculty member on specious “racist” grounds. College depts are not supposed to be political parties. They have been getting away with overtly political activities–not just by the faculty but as a university: holding anti-trump rallies for example, or giving students stipends or time off for leftists political action, or instituting “training” in overtly leftist, but never conservative, topics like toxic masculinity or problematic whiteness. Where is their action against communist oppression or in favor of gun rights? haha right
In short, as an academic, the moment you dissociate yourself from the alarmist bandwagon, you become a “denier”, a threat and thus a pariah. This says it all about the witch hunt they are ready to launch against any perceived rebellion to the Cause. It is totalitarian and some unknown PhD grad hopes to make a name for himself by playing Robespierre on blog… until visibly he can play it for real.
And one would have to pay huge tuition fees for their kids to go to those indoctrination centers “universities”?
Not a chance.
‘Melt the snowflakes’: the US campus activists stamping out students’ ‘safe spaces’
http://www.telegraph.co.uk/news/2018/12/14/melt-snowflakes-us-campus-activists-stamping-students-safe-spaces/
These brave people are visiting the UK to link up with like-minded people over here.
I can just imaging the manure hitting the fan when the SJW activists realise what is happening.
The shame society. It’s what holds primitive societies together.
I started following Dr. Mass’s blog after reading a paper on how wind spread the King Fire:
https://climate.nasa.gov/news/2771/local-winds-play-a-key-role-in-some-megafires/
I
So Dr Mass hangs with a group of thugs who want to jail skeptics, impose censorship, conflates skeptics with Holocaust deniers, and refers to skeptic speech as “an act of violence”. Dr Mass is a big boy, he knew who is was playing with, what the rules were, and the consequences for breaking them.
Nobody with a skeptical opinion on this issue is trying to jail or censor him; are we seriously proposing that skeptics use their “influence” to ask the thugs he hangs with to be kinder & gentler to Dr Mass? I’m having a hard time feeling sorry for him.
From the above article’s quoted statement from the Seattle Times: “Science shows carbon emissions remain in the atmosphere for hundreds to thousands of years, warming and dramatically changing the climate.”
Uhhhh . . . exactly what science would that be? I will accept even one simple science paper or report that proves that statement in a manner that can be verified independently.
Hint: no one has had the scientific means to track a group of “carbon emissions”, whether natural or human-originated, since well after Henri Becquerel discovered radioactivity in 1896, only 122 years ago . . . so what is the objective, reproducible evidence that “carbon emissions” remain in the atmosphere for hundreds to thousands of years? . . . and why the big range of uncertainty for this asserted “fact”???
Separately, there is scientific evidence that during the transition between the Bølling-Allerød interstadial (GI-1) and the Younger Dryas stadial (GS-1), atmospheric CO2 levels DECREASED from about 310 ppm down to about 240 ppm over a short span of ~200 years — reference Figure 4 of McElwaine, et. al., 2002, reproduced in https://wattsupwiththat.com/2018/05/14/poking-a-hole-in-the-latest-younger-dryas-impact-paper-uniformitarian-impact-craters-part-trois/