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Christopher Callahan

@ccallahan45.bsky.social
3K followers 348 following 38 posts

climate scientist: extreme heat, health, attribution, climate in the courts. heat wave is two words. iuclimateandsociety.com

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Reposted by Christopher Callahan
Elizabeth Lopatto @lopatto.bsky.social · 2h
Judith Butler Apology Form
Date:
Reason for behavior:
( ) The media convinced me that feminism was solved in the 1980s
( ) I miss not thinking about gender
( ) I was jealous of their nonbinary swag
( ) I never actually read their work
( ) I didn't realize how much of society is built on gender
( ) Mercury was in retrograde
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( ) I will hereby respect Judith Butler and I will NOT talk down on the best feminist thinker of our lifetimes
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Christopher Callahan @ccallahan45.bsky.social · 30/09/2026
A very fitting and timely episode, as conservative forces are once again gearing up to steal the emails of scientists (including mine) to help avoid accountability for climate change impacts www.politico.com/news/2026/09...
politico.com
Inside the anti-climate campaign against researchers
A POLITICO investigation reveals more than 100 open records requests demanding documents from climate scientists nationwide.
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Reposted by Christopher Callahan
Ed Burmila @edburmila.bsky.social · 30/09/2026
[SENATOR ERIC SCHMITT]: So you’re telling me under oath that you’ve never spoken with a bestselling author who is insane [JACK SMITH]: No [SCHMITT]: WELL THEN *unveils poster* please explain this picture of you with Naomi Wolf! [SMITH]: That is Naomi Klein sir
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Andrew Dessler @andrewdessler.com · 29/09/2026
Merchants of Doubt are going after extreme event attribution www.politico.com/news/2026/09...
politico.com
Inside the anti-climate campaign against researchers
A POLITICO investigation reveals more than 100 open records requests demanding documents from climate scientists nationwide.
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David Ho @davidho.bsky.social · 29/09/2026
Congratulations to my friend @hollyjeanbuck.bsky.social for being a 2026 MacArthur Fellow. I always knew she was a genius and this confirms it. 🥳
macfound.org
Holly Jean Buck
Investigating the social, ethical, and political dimensions of climate and energy policies and emerging technologies.
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Jessica Ellis @baddestmamajama.bsky.social · 29/09/2026
I have separated the art from the artist and am now whipping the art to stiff peaks, after which I will gently fold it into the artist before baking at 350 til golden and puffed
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Chelsea Harvey @chelseaeharvey.bsky.social · 28/09/2026
NEW - Conservative orgs are filing records requests by the dozens at public universities, demanding documents from climate researchers. @lesleyclark.bsky.social @corbinhiar.bsky.social & I have uncovered more than 100 requests, a campaign targets/allies say is an effort to derail climate litigation
politico.com
Inside the anti-climate campaign against researchers
A POLITICO investigation reveals more than 100 open records requests demanding documents from climate scientists nationwide.
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Reposted by Christopher Callahan
Lawrence Hurley @lawrencehurley.bsky.social · 28/09/2026
Major u-turn from Justice Alito as Supreme Court reveals he will no longer participate in the big climate change case being argued next week. Previously, the court told NBC News there was no reason for him to step aside despite his earlier recusal in same case.
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Marc Alessi @marc-alessi.bsky.social · 28/09/2026
New Commentary out in Nature Climate Action: we now live in a fundamentally different climate system due to the burning of fossil fuels. Because of this, any extreme weather event now occurs in a changed climate and is influenced by fossil fuel-driven climate change to some degree.
nature.com
The next phase of climate attribution - npj Climate Action
Attribution science has transformed our understanding of how anthropogenic emissions shape extreme weather events, yet the field remains constrained by repeatedly demonstrating anthropogenic influence...
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Bob Kopp @bobkopp.net · 26/09/2026
The literature about changes in nor’easters due to climate change is clear about two things: 1) more intense precipitation due to a warmer atmosphere, and 2) more extensive coastal flooding due to higher sea levels
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Christopher Callahan @ccallahan45.bsky.social · 25/09/2026
NYT best TV list didn't include Slings and Arrows. completely illegitimate exercise
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Justin S. Mankin @jsmankin.bsky.social · 25/09/2026
"Pricing El Niño is not the same as preventing its loss of life. Yet, many of those acting on its forecasts are using them to move money, not people, out of harm’s way." My editorial for Science on why hedging El Niño is not the same as adapting to it: www.science.org/eprint/DU6FR...
science.org
Hedging El Niño isn’t the same as adapting to it
Record-setting warm waters slosh eastward across the tropical Pacific, forming El Niño. This recurrent climate pattern reconfigures severe weather worldwide, and with it, the global economy. Scientist...
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David_j_roth @davidjroth.bsky.social · 24/09/2026
It's too depressing and obnoxious to write about, but virtually all of the doomy/horny AI hyperventilating is transparently displaced anxiety about our fucked climate and political situation. Even rich idiots know it's bad and being permitted to get worse. They're trying to write their own ending.
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samuel mehr @mehr.nz · 23/09/2026
after some in-depth discussions with my lab and also drawing on conversations on here, we've edited our new policy on AI usage in my lab feel free to adapt or re-use with attribution, or to reply to tell me how awful this policy is lol
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Dr. Jeff Masters @drjeffmasters.bsky.social · 22/09/2026
A classic El Niño impact: below-average monsoon rains in India. We're seeing a -15% deficit this year. India's top 5 rainfall deficit years all were during El Niño: 1877: -33% 1899: -29% 1918: -25% 1972: -24% 2009: -22% During moderate El Niño conditions in summer 2015, the deficit was -14%.
indiatoday.in
10 days left: Monsoon almost over, India's rain deficit at 15%, recovery bleak
India's southwest monsoon is entering its final phase with a 15 per cent rainfall deficit still in place. With withdrawal set to begin over parts of northwest India, the window for any meaningful reco...
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Henry Farrell @himself.bsky.social · 22/09/2026
www.programmablemutter.com/p/machine-go... what it says on the package
programmablemutter.com
Machine god metaphors eat your brain
There are other ways of thinking about AI
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Bob Kopp @bobkopp.net · 22/09/2026
NEW PAPER: In a new paper, jointly published in @agu.org Earth's Future & @ametsoc.org BAMS, and co-led by Melissa Kenney, @costasamaras.com and me, 175 authors outline priorities to guide the future of scientific assessments of climate change in the United States. 🧵
doi.org
Research Priorities for Robust Climate Assessments in the United States
A network of climate assessments plays a critical role in synthesizing the state of science to support evidence-based decision-making To support future U.S. and sub-national climate assessments, ...
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Steven (with a PH) @sjksalisbury.bsky.social · 20/09/2026
Christening a baby is nothing like christening a ship. I know that now. Once again I can only apologise.
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Philip Bump @pbump.com · 19/09/2026
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The Onion @theonion.com · 18/09/2026
Trans Teen Hatches Nefarious Plot To Undergo Years Of Medical Treatments And Counseling To Win At Swimming theonion.com/trans-teen-hatches-nef…
Trans Teen Hatches Nefarious Plot To Undergo Years Of Medical Treatments And Counseling To Win At Swimming
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Asheesh Kapur Siddique @asheeshks.org · 16/09/2026
More than any higher ed development in recent memory, institutional subsidies for AI at R1 universities prove that austerity is a choice. It is not “too expensive” to invest in a humanities research infrastructure; rather, it is a choice that R1 universities make not to & subsidize AI instead.
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Justin S. Mankin @jsmankin.bsky.social · 16/09/2026
"The amendment misconstrues the design and purpose of emissions scenarios; imposes an ad hoc evaluation standard that no emissions scenario ... can meet; [and] it would create confusion and errors into an assessment that already effectively and accurately communicates scenario dependence."
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Carl T. Bergstrom @carlbergstrom.com · 16/09/2026
Today, with backing from the ACLU, Kelton and twelve other named researchers filed a class action suit against the NIH under director Jay Bhattacharya for censoring their research and violating their First Amendment rights.
aclu.org
Researchers Challenge NIH Screening of Grants for Disfavored Viewpoints | American Civil Liberties Union
Class action lawsuit seeks to stop censorship and termination of federally funded scientific research
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ClimateFran @climatefran.bsky.social · 16/09/2026
New paper in Nature Climate Change today makes big improvements to 2 social cost of carbon damage sectors - labor productivity and agriculture Overall we find slightly lower mean SCC and much narrower uncertainty, mainly due to improved confidence around ag damages www.nature.com/articles/s41...
nature.com
New labour and agricultural damages improve climate cost estimates - Nature Climate Change
Heat stress reduces labour productivity, but economy-wide assessments are mostly missing. Using high-resolution projections and global economic modelling, the authors provide new cost estimates, and u...
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Christopher Callahan @ccallahan45.bsky.social · 15/09/2026
The White House plans to amend the National Climate Assessment to question RCP8.5. Last week, I, @jsmankin.bsky.social, and @vsrikrish.bsky.social commented that this proposal is "scientifically unsupported and procedurally deficient". You can see our comment here: essopenarchive.org/doi/full/10....
essopenarchive.org
Comment on Proposed Amendment to the Fifth National Climate Assessment | ESS Open Archive
This document is a public comment regarding the proposed amendment to the fifth National Climate Assessment (NCA5). The amendment directs any NCA5 results that are “dependent on RCP8.5, SSP5-8.5, or e...
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Gareth Funning @gfun.earth · 15/09/2026
NSF GEO webinar summary: we have reduced programs from 15 down to 3, we have no deadlines, we have no guidelines on project size, duration or budget, we have no money
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Christopher Callahan @ccallahan45.bsky.social · 15/09/2026
The White House plans to amend the National Climate Assessment to question RCP8.5. Last week, I, @jsmankin.bsky.social, and @vsrikrish.bsky.social commented that this proposal is "scientifically unsupported and procedurally deficient". You can see our comment here: essopenarchive.org/doi/full/10....
essopenarchive.org
Comment on Proposed Amendment to the Fifth National Climate Assessment | ESS Open Archive
This document is a public comment regarding the proposed amendment to the fifth National Climate Assessment (NCA5). The amendment directs any NCA5 results that are “dependent on RCP8.5, SSP5-8.5, or e...
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Tom Scocca @tomscocca.bsky.social · 14/09/2026
Every syllable of this segment is a transparent one-for-one rhetorical and psychological substitute for saying or doing anything about global warming
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Terence Tao @teorth.bsky.social · 11/09/2026
A group of 25 Fields Medalists, including myself, have made a joint declaration on Math and AI: mathandai.org . We welcome additional signatories. See also this article in the Economist announcing the declaration: www.economist.com/science-and-...
mathandai.org
Declaration — Math and AI
Read the declaration and add your name.
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Jacquelyn Gill @jacquelyngill.bsky.social · 10/09/2026
The enshittification of the National Science Foundation will go down as one of the greatest moral injuries I've experienced in my career.
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David Ho @davidho.bsky.social · 10/09/2026
Climeworks' Mammoth facility in Iceland removed 675 tonnes of CO₂ in the first half of 2026, almost 6x as much as in 2025. If they keep it up, that'll be 1350 tonnes a year*. That's a time machine that takes us back 1 whole second in a year! 🙄 *Mammoth has a stated capacity of 36,000 tonnes. 🫠
bloomberg.com
Carbon Removal Pioneer Climeworks Increases CO2 Capture Sixfold
The world’s largest direct air capture plant is sucking more carbon dioxide from the atmosphere at a lower cost, an improvement for a sector struggling to scale economically as global warming surpasse...
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Casey Ivanovich @ccivanovich.bsky.social · 10/09/2026
Feel like heatwaves started early this year? Or like they're dragging on later than ever? Our new @aguadvances.bsky.social paper shows that extreme heat is no longer limited to summer and is now creeping into the shoulder seasons -- but unevenly so. (1/6) doi.org/10.1029/2026...
doi.org
Extreme Dry and Humid Heat Seasons Are Changing Asymmetrically
Extreme dry and humid heat events show distinct seasonality often not aligned with meteorological summer, even in the tropics Extreme heat seasons have expanded since the 1980s over about half of...
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Aaron Huertas @aaronhuertas.bsky.social · 09/09/2026
Boycott is still on. No Starbucks till the union gets a contract.
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GPT-Ern Malley @denam.bsky.social · 08/09/2026
My read at least is him going "you dumb motherfuckers are destroying the intellectual commons" in an extremely nice and pleasant fashion
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Daniel Swain @weatherwest.bsky.social · 09/09/2026
And so it begins.
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Alexander Lees @alexanderlees.bsky.social · 07/09/2026
The person overseeing the U.S. Global Change Research Program has no understanding of global change.
Twitter post by Matthew WielickiMatthew Wielicki Twitter
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Andrew Dessler @andrewdessler.com · 08/09/2026
Me, after I said that RCP8.5 serves a valuable role in the evaluation of climate risk
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austin_walker @austinwalker.bsky.social · 07/09/2026
Gonna have to wrap the screen we watch this on in one of those anti-bedbug plastic covers. Gonna have to put the film in a medical waste container once we're done.
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Anna Kornbluh @annakornbluh.bsky.social · 06/09/2026
there's the abject failure of university+college presidents to come together as a group on day 1 to stand up for the U.S.'s second largest export + most powerful engine of ideas +innovation then there's the abhorrent failure of Darmouth's president in particular www.nybooks.com/articles/202...
nybooks.com
The Dartmouth Exception | Jacob Weisberg
Among its peers in the Ivy League, Dartmouth was perfectly positioned to resist Trump’s attack on higher education. It chose not to.
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Bob Kopp @bobkopp.net · 06/09/2026
Presidents are hired & evaluated by their boards, who predominantly prioritize fundraising & avoiding challenging the powerful—not teaching, research or service. To change the presidents’ behaviors, you need to change the boards. Which among other things means you need strong faculty unions.
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ceej @ceej.online · 12/06/2024
My wife, a prodigious sleep-talker, failed to disclose her affliction when we started dating, which led to the fright of my life the night she sat bolt upright in bed and in a low flat monotone loudly declared that “THIRTEEN BABIES REMAIN UNFATHERED.”
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Brendel @brendelbored.bsky.social · 04/09/2026
He truly got checkmated by a literal pawn
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Peter Brannen @peterbrannen.bsky.social · 02/09/2026
[Norman Rockwell town meeting guy]: I still think 1.5°C of warming is bad
Screenshot of paper showing 1.5C is catastrophic for coral reefs
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Danny Cullenward @ghgpolicy.org · 02/09/2026
CDR (of all stripes) lacks the features of technologies that rapidly come down cost curves, e.g., modularity, private benefits, competitive advantages in relation to incumbent technologies, etc. So I think we are stuck with David's problem — one has to mobilize public money at a vast scale.
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Amanda Kolson Hurley @amandakhurley.bsky.social · 02/09/2026
Nepal is demanding climate compensation from the world’s biggest emitters of greenhouse gases. “Nepal must hold its head high internationally and turn this into a matter of justice,” said Foreign Minister Shisir Khanal. www.bloomberg.com/news/article...
bloomberg.com
Nepal Seeks Climate Compensation From China, US and India
Nepal is demanding climate compensation from the world’s biggest emitters of greenhouse gases after deadly floods in the country killed more than a thousand people and left even more missing.
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Nature Portfolio @natureportfolio.nature.com · 01/09/2026
Nearly one in ten emergency department visits during major US heatwaves in 2025 were attributable to heat, according to a paper in Nature Health. go.nature.com/4gMm9OJ 🧪
This is figure 1, which shows geographic distribution of ED visits and warm-season temperatures across the Truveta study states, 2023–2025.
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Daniel J. Vecellio @sciencedjv.bsky.social · 31/08/2026
We recently published an update to our 2023 PNAS study looking at exposure to uncompensable heat stress in warmer worlds. By using age-stratified limits rather than a single one, exposure goes way up mainly in the elderly cohort. @thelancetplanet.bsky.social www.sciencedirect.com/science/arti...
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Andrew (🎃) @athomashemlock.bsky.social · 31/08/2026
Every single article about solar power and battery tech is like "We put solar panels on the Hellmouth and the Hellmouth is now reciting poetry and smells like peppermint and teaching young orphaned birds how to fly. Also we can power a small city block."
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Jeff Goodell @jeffgoodell.bsky.social · 31/08/2026
“Between 2018 and 2025, we estimate that some 9,000 deaths each year in the [U.S.] are impacted by heat — a factor of five higher than the official average over that same period. Some years, heat-related deaths can top 10,000.” Even this, I'd argue, is an underestimate. Great work by @npr.org
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