Christopher Callahan
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ccallahan45.bsky.social
Christopher Callahan
@ccallahan45.bsky.social
climate scientist, bicycle cavalry in the war on cars. iuclimateandsociety.com
RIP to the late Friday afternoon AGU sessions attended by 2 people 😥
November 5, 2025 at 11:21 PM
Dartmouth says no to the compact:
October 18, 2025 at 2:56 PM
@joerirogelj.bsky.social might be the other person who has this on hand. This fig from 2016 is one way of visualizing something along these lines. From: www.nature.com/articles/nat...
September 30, 2025 at 8:46 PM
September 23, 2025 at 5:38 PM
September 18, 2025 at 10:16 PM
NEW: Climate change to increase emergency department visits in California. New paper in Science Advances, led by @gouldcf.bsky.social, shows that ED visits respond linearly to temperature, increasing dramatically with warming, despite nonlinear mortality response.
www.science.org/doi/10.1126/...
July 30, 2025 at 6:15 PM
July 29, 2025 at 8:34 PM
🤔
July 29, 2025 at 8:00 PM
I will admit that seeing this plot (fig 4) was my first real “uh oh” moment about this
June 30, 2025 at 8:18 PM
Europe has been sweltering under a heat dome for days - the same weather system that has driven deadly heat in Europe the past. Our research has shown that with every degree of global warming, the same type of heat dome will get deadlier and deadlier.
eartharxiv.org/repository/v...
June 30, 2025 at 4:26 PM
The 2003 France heat wave was catastrophic - and, our newest estimate is that climate change killed >6,000 of those 15,000 people. Even more than 20 years ago, extreme heat mortality was inextricably tied to dangerous anthropogenic interference with the climate.

eartharxiv.org/repository/v...
June 24, 2025 at 1:23 PM
June 10, 2025 at 12:52 AM
NEW: Climate mitigation has huge health benefits by limiting wildfire smoke. In our new preprint, we find every million tons of CO2 reduced saves $15 million in the US via avoided smoke-related mortality. These benefits alone compensate for 25% of the IRA's abatement cost.
www.nber.org/papers/w33829
May 26, 2025 at 2:54 PM
For people who said our fossil fuel producer attribution paper lets consumers off the hook: here is the drum I will keep banging
May 7, 2025 at 2:23 PM
No, but this is something we discuss explicitly in the paper
April 23, 2025 at 4:38 PM
March 7, 2025 at 10:00 PM
NEW: Mass heat mortality events are coming. In our new preprint, we project tens of thousands of deaths per week in Europe, if the weather patterns that produced heat waves historically happen again at future -- or even current -- global temperatures.

eartharxiv.org/repository/v...
January 15, 2025 at 2:15 AM
December 14, 2024 at 1:30 AM
In April of last year, we published a paper in BAMS showing that warmer air temperatures increase home runs in MLB. Now, a companion analysis has been released showing the same relationship in Japanese baseball! Very cool stuff. journals.ametsoc.org/view/journal...
December 6, 2024 at 10:45 PM
On Friday afternoon at #AGU24, I'll be presenting this new (and, frankly, worrying) work of ours on extreme heat and mortality. Come see it! Poster GC53C-0380.
December 4, 2024 at 4:05 PM
looking at every new paper breaking basic regression tools
December 1, 2024 at 2:37 AM
I love,,, the Bay Area
November 20, 2024 at 4:39 PM
Funniest part about all of this was when the grads dug up his old posts about <checks notes> heliskiing
November 12, 2024 at 6:42 AM
Not exactly floods but this figure from Kerry Emanuel’s 2011 paper on hurricane damage is about structural damage to buildings from winds - below a threshold the building is fine but then damage rapidly rises above the threshold

journals.ametsoc.org/view/journal...
November 7, 2024 at 3:05 AM
Last year, western North Carolina was identified a hotspot of property overvaluation due to a lack of consideration of flood risk. So much for "safe havens" from climate change.
www.nature.com/articles/s41...
October 1, 2024 at 11:04 PM