Christopher Callahan @ccallahan45.bsky.social · 30/09/2026A 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.comInside the anti-climate campaign against researchersA POLITICO investigation reveals more than 100 open records requests demanding documents from climate scientists nationwide. 095
Reposted by Christopher CallahanEd 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 231483201
Reposted by Christopher CallahanAndrew Dessler @andrewdessler.com · 29/09/2026Merchants of Doubt are going after extreme event attribution www.politico.com/news/2026/09...politico.comInside the anti-climate campaign against researchersA POLITICO investigation reveals more than 100 open records requests demanding documents from climate scientists nationwide. 12714
Reposted by Christopher CallahanDavid Ho @davidho.bsky.social · 29/09/2026Congratulations to my friend @hollyjeanbuck.bsky.social for being a 2026 MacArthur Fellow. I always knew she was a genius and this confirms it. 🥳macfound.orgHolly Jean BuckInvestigating the social, ethical, and political dimensions of climate and energy policies and emerging technologies. 315223
Reposted by Christopher CallahanJessica Ellis @baddestmamajama.bsky.social · 29/09/2026I 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 3544951088
Reposted by Christopher CallahanChelsea Harvey @chelseaeharvey.bsky.social · 28/09/2026NEW - 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 litigationpolitico.comInside the anti-climate campaign against researchersA POLITICO investigation reveals more than 100 open records requests demanding documents from climate scientists nationwide. 110673
Reposted by Christopher CallahanLawrence Hurley @lawrencehurley.bsky.social · 28/09/2026Major 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. 581267296
Reposted by Christopher CallahanMarc Alessi @marc-alessi.bsky.social · 28/09/2026New 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.comThe next phase of climate attribution - npj Climate ActionAttribution science has transformed our understanding of how anthropogenic emissions shape extreme weather events, yet the field remains constrained by repeatedly demonstrating anthropogenic influence... 714576
Reposted by Christopher CallahanBob Kopp @bobkopp.net · 26/09/2026The 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 315449
Christopher Callahan @ccallahan45.bsky.social · 25/09/2026NYT best TV list didn't include Slings and Arrows. completely illegitimate exercise 000
Reposted by Christopher CallahanJustin 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.orgHedging El Niño isn’t the same as adapting to itRecord-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... 17229
Reposted by Christopher CallahanDavid_j_roth @davidjroth.bsky.social · 24/09/2026It'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. 8460501067
Reposted by Christopher Callahansamuel mehr @mehr.nz · 23/09/2026after 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 1312838
Reposted by Christopher CallahanDr. Jeff Masters @drjeffmasters.bsky.social · 22/09/2026A 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.in10 days left: Monsoon almost over, India's rain deficit at 15%, recovery bleakIndia'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... 12311
Reposted by Christopher CallahanHenry Farrell @himself.bsky.social · 22/09/2026www.programmablemutter.com/p/machine-go... what it says on the packageprogrammablemutter.comMachine god metaphors eat your brainThere are other ways of thinking about AI 610829
Reposted by Christopher CallahanBob Kopp @bobkopp.net · 22/09/2026NEW 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.orgResearch Priorities for Robust Climate Assessments in the United StatesA 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, ... 114783
Reposted by Christopher CallahanSteven (with a PH) @sjksalisbury.bsky.social · 20/09/2026Christening a baby is nothing like christening a ship. I know that now. Once again I can only apologise. 160191043857
Reposted by Christopher CallahanThe Onion @theonion.com · 18/09/2026Trans Teen Hatches Nefarious Plot To Undergo Years Of Medical Treatments And Counseling To Win At Swimming theonion.com/trans-teen-hatches-nef… 69129182819
Reposted by Christopher CallahanAsheesh Kapur Siddique @asheeshks.org · 16/09/2026More 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. 4644255
Reposted by Christopher CallahanJustin 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." 074
Reposted by Christopher CallahanCarl T. Bergstrom @carlbergstrom.com · 16/09/2026Today, 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.orgResearchers Challenge NIH Screening of Grants for Disfavored Viewpoints | American Civil Liberties UnionClass action lawsuit seeks to stop censorship and termination of federally funded scientific research 4692143
Reposted by Christopher CallahanClimateFran @climatefran.bsky.social · 16/09/2026New 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.comNew labour and agricultural damages improve climate cost estimates - Nature Climate ChangeHeat 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... 2187
Reposted by Christopher CallahanChristopher Callahan @ccallahan45.bsky.social · 15/09/2026The 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.orgComment on Proposed Amendment to the Fifth National Climate Assessment | ESS Open ArchiveThis 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... 13220
Reposted by Christopher CallahanGareth Funning @gfun.earth · 15/09/2026NSF 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 85933
Christopher Callahan @ccallahan45.bsky.social · 15/09/2026The 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.orgComment on Proposed Amendment to the Fifth National Climate Assessment | ESS Open ArchiveThis 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... 13220
Reposted by Christopher CallahanTom Scocca @tomscocca.bsky.social · 14/09/2026Every syllable of this segment is a transparent one-for-one rhetorical and psychological substitute for saying or doing anything about global warming 1135944
Reposted by Christopher CallahanTerence Tao @teorth.bsky.social · 11/09/2026A 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.orgDeclaration — Math and AIRead the declaration and add your name. 422052929
Reposted by Christopher CallahanJacquelyn Gill @jacquelyngill.bsky.social · 10/09/2026The enshittification of the National Science Foundation will go down as one of the greatest moral injuries I've experienced in my career. 825470
Reposted by Christopher CallahanDavid Ho @davidho.bsky.social · 10/09/2026Climeworks' 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.comCarbon Removal Pioneer Climeworks Increases CO2 Capture SixfoldThe 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... 916441
Reposted by Christopher CallahanCasey Ivanovich @ccivanovich.bsky.social · 10/09/2026Feel 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.orgExtreme Dry and Humid Heat Seasons Are Changing AsymmetricallyExtreme 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... 1389
Reposted by Christopher CallahanAaron Huertas @aaronhuertas.bsky.social · 09/09/2026Boycott is still on. No Starbucks till the union gets a contract. 17974335
Reposted by Christopher CallahanGPT-Ern Malley @denam.bsky.social · 08/09/2026My read at least is him going "you dumb motherfuckers are destroying the intellectual commons" in an extremely nice and pleasant fashion 25010
Reposted by Christopher CallahanDaniel Swain @weatherwest.bsky.social · 09/09/2026And so it begins. 919133
Reposted by Christopher CallahanAlexander Lees @alexanderlees.bsky.social · 07/09/2026The person overseeing the U.S. Global Change Research Program has no understanding of global change. 1719248
Reposted by Christopher CallahanAndrew Dessler @andrewdessler.com · 08/09/2026Me, after I said that RCP8.5 serves a valuable role in the evaluation of climate risk 4947
Reposted by Christopher Callahanaustin_walker @austinwalker.bsky.social · 07/09/2026Gonna 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. 17705127
Reposted by Christopher CallahanAnna Kornbluh @annakornbluh.bsky.social · 06/09/2026there'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.comThe Dartmouth Exception | Jacob WeisbergAmong its peers in the Ivy League, Dartmouth was perfectly positioned to resist Trump’s attack on higher education. It chose not to. 714238
Reposted by Christopher CallahanBob Kopp @bobkopp.net · 06/09/2026Presidents 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. 25711
Reposted by Christopher Callahanceej @ceej.online · 12/06/2024My 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.” 1304555525
Reposted by Christopher CallahanBrendel @brendelbored.bsky.social · 04/09/2026He truly got checkmated by a literal pawn 563308404
Reposted by Christopher CallahanPeter Brannen @peterbrannen.bsky.social · 02/09/2026[Norman Rockwell town meeting guy]: I still think 1.5°C of warming is bad 13912
Reposted by Christopher CallahanDanny Cullenward @ghgpolicy.org · 02/09/2026CDR (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. 2294
Reposted by Christopher CallahanAmanda Kolson Hurley @amandakhurley.bsky.social · 02/09/2026Nepal 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.comNepal Seeks Climate Compensation From China, US and IndiaNepal 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. 03614
Reposted by Christopher CallahanNature Portfolio @natureportfolio.nature.com · 01/09/2026Nearly 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 🧪 02013
Reposted by Christopher CallahanDaniel J. Vecellio @sciencedjv.bsky.social · 31/08/2026We 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... 11711
Reposted by Christopher CallahanAndrew (🎃) @athomashemlock.bsky.social · 31/08/2026Every 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." 3694123
Reposted by Christopher CallahanJeff 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 01613