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Christopher Callahan

@ccallahan45.bsky.social

climate scientist: extreme heat, health, attribution, climate in the courts. iuclimateandsociety.com

2,684 Followers  |  315 Following  |  271 Posts  |  Joined: 27.04.2023
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Posts by Christopher Callahan (@ccallahan45.bsky.social)

The unelected official heading the White House's Office of Management and Budget, Russell Vought, continues to prevent Americans from discovering new insights on:

1) how earthquakes happen.
2) how mineral resources may be found and exploited.
3) how our planet works.

01.03.2026 15:37 β€” πŸ‘ 18    πŸ” 7    πŸ’¬ 1    πŸ“Œ 0
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Comprehensive evidence implies a higher social cost of CO2 - Nature Coupling advances in socioeconomic projections, climate models, damage functions and discounting methods yields an estimate of the social cost of carbon of US$185 per tonne of CO2β€”triple the wide...

It’s good work! The other place to look for new damage function stuff since 2019 is all the work that went into the Biden social cost of carbon. e.g.: www.nature.com/articles/s41...

01.03.2026 00:02 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Scandinavian Swimmers

01.03.2026 00:00 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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The Macroeconomic Impact of Climate Change: Global vs. Local Temperature Founded in 1920, the NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings among academics, public policy makers, an...

This is the other one that has caught a lot of attention - soon to be out in QJE

www.nber.org/papers/w32450

28.02.2026 23:46 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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The Global Economic Impact of Climate Change: An Empirical Perspective Founded in 1920, the NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings among academics, public policy makers, an...

www.nber.org/papers/w34357

28.02.2026 23:41 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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theonion.com/this-war-wil...

28.02.2026 11:57 β€” πŸ‘ 3626    πŸ” 820    πŸ’¬ 39    πŸ“Œ 22
War is hell, mash meme

War is hell, mash meme

28.02.2026 12:51 β€” πŸ‘ 539    πŸ” 207    πŸ’¬ 0    πŸ“Œ 7
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The Biden Admin directed hundreds of billions to clean energy/manufacturing.

Did these investments shift public opinion?

We find that these projects are visible but not traceable: People notice nearby investments, but connect them to Governors, not Biden.

Thread πŸ‘‡
www.pnas.org/doi/10.1073/...

26.02.2026 17:20 β€” πŸ‘ 71    πŸ” 32    πŸ’¬ 2    πŸ“Œ 4

"soup for my family" is an all-timer imo. never seen anything like it

26.02.2026 14:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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We need a global assessment of avoidable climate-change risks To understand the urgency of emissions reductions, policymakers and citizens need a full analysis of what is at stake.

In this week's Nature we argue there is a pressing need for a global assessment of avoidable climate-change risks. To understand the urgency of emissions reductions, policy makers and citizens need a full analysis of what is at stake including the worst-case scenarios. www.nature.com/articles/d41...

25.02.2026 17:27 β€” πŸ‘ 9    πŸ” 9    πŸ’¬ 0    πŸ“Œ 0
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Indiana U. won a title and lost its soul | Will Bunch Newsletter Plus, the pundits are so wrong about Dems and 2028.

Indiana University's football crown was the feel-good story of the year. Off the field...not so much

Ranked last for free speech, DEI cuts, slashing the humanities while paying its coach $13M under MAGA trustees

My column on how IU ranks No. 1 in moral bankruptcy www.inquirer.com/columnists/a...

24.02.2026 17:09 β€” πŸ‘ 342    πŸ” 143    πŸ’¬ 13    πŸ“Œ 25

came from nca5 economics chapter i think

23.02.2026 21:48 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

The null hypothesis here should of course be that they'll take any opportunity to end these lawsuits. On the other hand, the administration is <2 weeks out from arguing that federal law does NOT regulate greenhouse gases! Which seems to erase the only actual argument they have here.

23.02.2026 15:00 β€” πŸ‘ 3    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
SUNCOR ENERGY, INC., ET AL. V. COMM'RS BOULDER CTY., ET AL.
 The petition for a writ of certiorari is granted. In
 addition to the question presented by the petition, the parties
are directed to brief and argue the following question: Whether
this Court has statutory and Article III jurisdiction to hear
this case.

SUNCOR ENERGY, INC., ET AL. V. COMM'RS BOULDER CTY., ET AL. The petition for a writ of certiorari is granted. In addition to the question presented by the petition, the parties are directed to brief and argue the following question: Whether this Court has statutory and Article III jurisdiction to hear this case.

New: The Supreme Court takes up a MAJOR climate case that asks whether federal law preempts (that is, forbids) state-level claims against fossil fuel companies for damages related to climate change.

Climate advocates urged SCOTUS not to take this up... www.supremecourt.gov/orders/court...

23.02.2026 14:33 β€” πŸ‘ 242    πŸ” 96    πŸ’¬ 10    πŸ“Œ 13

colin

22.02.2026 15:39 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Alysa Liu wins the Olympic gold medal for the United States
YouTube video by Olympics Alysa Liu wins the Olympic gold medal for the United States

I urge you to stop what you're doing and watch Alysa Liu's free skate from yesterday. I have never seen anything like this. I understand why sports writers are born now. I have never seen anyone as free from the burdens of this world as this pierced Oakland girl spinning to Donna Summers.

20.02.2026 16:52 β€” πŸ‘ 5443    πŸ” 1380    πŸ’¬ 153    πŸ“Œ 324

Here is a link that should work: www.dropbox.com/scl/fi/brax8...

20.02.2026 15:49 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Valuing wildfire smoke–related mortality benefits from climate mitigation | PNAS Human-induced climate change has increased wildfire risks, associated air pollution, and health damages in North America. Despite its large potenti...

🚨πŸ”₯ NEW: Increasing mortality from wildfire smoke is directly traceable to greenhouse gas emissions. In our new paper in @pnas.org , we show that every megaton of CO2 emitted costs the US more than 10 million dollars in health costs from wildfire smoke. www.pnas.org/doi/10.1073/...

19.02.2026 18:46 β€” πŸ‘ 95    πŸ” 55    πŸ’¬ 4    πŸ“Œ 5

Great coverage of Kyan Shlipak's recent #ScienceAdvances study on the health impacts of U.S. residential wood burning, by @drgaryfuller.bsky.social, for the @theguardian.com @science.org

20.02.2026 14:38 β€” πŸ‘ 6    πŸ” 6    πŸ’¬ 1    πŸ“Œ 1
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Congrats to BART rider and Oakland legend Alysa Liu on winning a gold medal at the Olympics and making the Bay Area proud!

19.02.2026 22:21 β€” πŸ‘ 7607    πŸ” 1074    πŸ’¬ 47    πŸ“Œ 133
The debt burden of tropical cyclones and climate change

God almighty, this preprint: exposed countries have a 30% higher debt-to-GDP ratio because of tropical cyclones since 1990 eartharxiv.org/repository/v...

19.02.2026 22:26 β€” πŸ‘ 21    πŸ” 9    πŸ’¬ 2    πŸ“Œ 1

I would settle for one (1) grant

19.02.2026 23:26 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

The better the science gets, the more dangerous the endangerment becomes.

19.02.2026 19:10 β€” πŸ‘ 11    πŸ” 4    πŸ’¬ 0    πŸ“Œ 0

Paper led by @minghaoqiu.bsky.social in collaboration with @ivanhigueram.com @marshallburke.bsky.social and others...

19.02.2026 18:46 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Valuing wildfire smoke–related mortality benefits from climate mitigation | PNAS Human-induced climate change has increased wildfire risks, associated air pollution, and health damages in North America. Despite its large potenti...

🚨πŸ”₯ NEW: Increasing mortality from wildfire smoke is directly traceable to greenhouse gas emissions. In our new paper in @pnas.org , we show that every megaton of CO2 emitted costs the US more than 10 million dollars in health costs from wildfire smoke. www.pnas.org/doi/10.1073/...

19.02.2026 18:46 β€” πŸ‘ 95    πŸ” 55    πŸ’¬ 4    πŸ“Œ 5
Post image 19.02.2026 14:37 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
A photo of an ice cream machine with a sign reading, "Anything is possible with ice cream." Beneath that is a hand lettered sign reading, "No ice cream".

A photo of an ice cream machine with a sign reading, "Anything is possible with ice cream." Beneath that is a hand lettered sign reading, "No ice cream".

2026 basically

18.02.2026 16:23 β€” πŸ‘ 40930    πŸ” 10898    πŸ’¬ 313    πŸ“Œ 340

Quick reminder that 3 Β°C of warming would set Europe up for heat domes that kill 30,000 people in a single week. www.nature.com/articles/s41...

17.02.2026 18:52 β€” πŸ‘ 26    πŸ” 19    πŸ’¬ 3    πŸ“Œ 1

Quick reminder that 3 Β°C of warming would set Europe up for heat domes that kill 30,000 people in a single week. www.nature.com/articles/s41...

17.02.2026 18:52 β€” πŸ‘ 26    πŸ” 19    πŸ’¬ 3    πŸ“Œ 1