Charlie Koven
@ckoven.bsky.social
Climate and carbon cycle scientist. I help make computer models of the biosphere and experiment on them so that we don't have to on the real one.
https://scholar.google.com/citations?user=fB5Lnz4AAAAJ
https://scholar.google.com/citations?user=fB5Lnz4AAAAJ
Reposted by Charlie Koven
NCAR represents what is possible when a nation chooses to invest in science as a public good, writes @carlonimbus.bsky.social of @ucs.org. #SaveNCAR eos.org/opinions/wha...
What Americans Lose If Their National Center for Atmospheric Research Is Dismantled - Eos
Five ways dismantling NCAR will cost the American people, and two ways to save it.
eos.org
January 27, 2026 at 2:49 PM
NCAR represents what is possible when a nation chooses to invest in science as a public good, writes @carlonimbus.bsky.social of @ucs.org. #SaveNCAR eos.org/opinions/wha...
Reposted by Charlie Koven
We knew the NSF letter about NCAR would come. I think this is an occasion that will require great coordination and strategical thinking. UCAR should respond as a block, coordinating a response across universities (especially in the South, and large public universities that use NCAR data a lot)
January 24, 2026 at 2:18 AM
We knew the NSF letter about NCAR would come. I think this is an occasion that will require great coordination and strategical thinking. UCAR should respond as a block, coordinating a response across universities (especially in the South, and large public universities that use NCAR data a lot)
Reposted by Charlie Koven
I would strongly encourage those who value the scientific & societal legacies of NCAR to offer feedback by March 13. I would expect, under present circumstances, perspectives from industry partners will be especially critical, though everyone's voice is of course important.
January 23, 2026 at 9:57 PM
I would strongly encourage those who value the scientific & societal legacies of NCAR to offer feedback by March 13. I would expect, under present circumstances, perspectives from industry partners will be especially critical, though everyone's voice is of course important.
Reposted by Charlie Koven
This week, the Trump Administration announced it's decision to withdraw from international organizations and treaties that support global cooperation on climate and environmental issues, a huge setback for global science. Read AGU's full statement:
news.agu.org/press-releas...
news.agu.org/press-releas...
AGU statement on US withdrawal from climate and environmental organizations and treaties
The Trump Administration’s announcement that the United States will withdraw from a multitude of international organizations and treaties that support global cooperation on climate and environmental i...
news.agu.org
January 9, 2026 at 8:57 PM
This week, the Trump Administration announced it's decision to withdraw from international organizations and treaties that support global cooperation on climate and environmental issues, a huge setback for global science. Read AGU's full statement:
news.agu.org/press-releas...
news.agu.org/press-releas...
Reposted by Charlie Koven
The federal govt may be burning global cooperation on climate science to the ground, but we can and are pushing back where we can. We have more than 70 US scientists currently on IPCC reports, with more to be selected this month for CDR methods report. The USAA-IPCC coalition is up for this fight.
The US has some of the world’s best climate scientists (and more of them than anywhere else) & has contributed disproportionately to understanding the climate system. It’s idiotic for the US to withdraw from the UN Framework Convention on Climate Change & the IPCC but it’s on brand for this regime.
Withdrawing the United States from International Organizations, Conventions, and Treaties that Are Contrary to the Interests of the United States
MEMORANDUM FOR THE HEADS OF EXECUTIVE DEPARTMENTS AND AGENCIES By the authority vested in me as President by the Constitution and the laws of the United
www.whitehouse.gov
January 8, 2026 at 2:38 PM
The federal govt may be burning global cooperation on climate science to the ground, but we can and are pushing back where we can. We have more than 70 US scientists currently on IPCC reports, with more to be selected this month for CDR methods report. The USAA-IPCC coalition is up for this fight.
So this is how they’ve chosen to mark the one year anniversary of the Los Angeles fires.
Trump Pulls Out of Global Climate Treaty
www.nytimes.com
January 8, 2026 at 4:34 AM
So this is how they’ve chosen to mark the one year anniversary of the Los Angeles fires.
Reposted by Charlie Koven
The deadline for DOE's SULI (Science Undergraduate Laboratory Internship) summer 2026 program is in TWO DAYS: science.osti.gov/wdts/suli/Ke... Are you an undergraduate interested in STEM? Apply!
SULI Key Dates | U.S. DOE Office of Science (SC)
The page provides the information about SULI Key Dates.
science.osti.gov
January 5, 2026 at 2:22 PM
The deadline for DOE's SULI (Science Undergraduate Laboratory Internship) summer 2026 program is in TWO DAYS: science.osti.gov/wdts/suli/Ke... Are you an undergraduate interested in STEM? Apply!
Reposted by Charlie Koven
The expected 2.5 ft above normal high tide on Saturday morning hasn't been seen since 1998 https://x.com/NWSBayArea/status/2007014464575660329
January 2, 2026 at 9:05 AM
The expected 2.5 ft above normal high tide on Saturday morning hasn't been seen since 1998 https://x.com/NWSBayArea/status/2007014464575660329
Reposted by Charlie Koven
December 19, 2025 at 2:03 AM
NCAR’s Mesa Lab is literally a science castle dedicated to understanding our planet in an open and collaborative way, and leading the world in that effort. We cannot let this happen.
Efforts to dissolve the @ncar-ucar.bsky.social, including closing the center’s headquarters in Boulder, will begin immediately, an official told @usatoday.com 🧪
eos.org/research-and...
eos.org/research-and...
Trump Administration Plans to Break Up NCAR - Eos
The Trump administration is planning to dismantle the National Center for Atmospheric Research, one of the world’s leading climate and Earth science research laboratories, according to a statement fro...
eos.org
December 17, 2025 at 4:02 PM
NCAR’s Mesa Lab is literally a science castle dedicated to understanding our planet in an open and collaborative way, and leading the world in that effort. We cannot let this happen.
Reposted by Charlie Koven
The beautiful idea of NCAR, to improve understanding of our planet through a cooperative, shared and open intellectual team effort, is literally what has got me out of bed every morning for nearly two decades. This cannot, CANNOT be allowed to happen.
eu.usatoday.com/story/news/p...
eu.usatoday.com/story/news/p...
Trump moves to dismantle major US climate research center in Colorado
The Trump administration is breaking up the National Center for Atmospheric Research, taking aim at one of the world's leading climate research labs.
eu.usatoday.com
December 17, 2025 at 7:39 AM
The beautiful idea of NCAR, to improve understanding of our planet through a cooperative, shared and open intellectual team effort, is literally what has got me out of bed every morning for nearly two decades. This cannot, CANNOT be allowed to happen.
eu.usatoday.com/story/news/p...
eu.usatoday.com/story/news/p...
Reposted by Charlie Koven
A deeply dangerous — and blatantly retaliatory action against Colorado — by the Trump administration.
NCAR is one of the most renowned scientific facilities in the WORLD — where scientists perform cutting-edge research everyday.
We will fight this reckless directive with every legal tool we have.
NCAR is one of the most renowned scientific facilities in the WORLD — where scientists perform cutting-edge research everyday.
We will fight this reckless directive with every legal tool we have.
Exclusive: The Trump administration is moving to dismantle the National Center for Atmospheric Research in Colorado, according to a senior White House official, taking aim at one of the world's leading climate research labs.
Trump moves to dismantle major US climate research center in Colorado
The Trump administration is breaking up the National Center for Atmospheric Research, taking aim at one of the world's leading climate research labs.
bit.ly
December 17, 2025 at 3:23 AM
A deeply dangerous — and blatantly retaliatory action against Colorado — by the Trump administration.
NCAR is one of the most renowned scientific facilities in the WORLD — where scientists perform cutting-edge research everyday.
We will fight this reckless directive with every legal tool we have.
NCAR is one of the most renowned scientific facilities in the WORLD — where scientists perform cutting-edge research everyday.
We will fight this reckless directive with every legal tool we have.
Reposted by Charlie Koven
They’re stealing from us. They are stealing from us and we have to put a stop to this. This cannot stand.
Exclusive: The Trump administration is moving to dismantle the National Center for Atmospheric Research in Colorado, according to a senior White House official, taking aim at one of the world's leading climate research labs.
Trump moves to dismantle major US climate research center in Colorado
The Trump administration is breaking up the National Center for Atmospheric Research, taking aim at one of the world's leading climate research labs.
bit.ly
December 17, 2025 at 2:25 AM
They’re stealing from us. They are stealing from us and we have to put a stop to this. This cannot stand.
Reposted by Charlie Koven
This wouldn't just be a national tragedy but a global one. Just mind-boggling vandalism.
Exclusive: The Trump administration is moving to dismantle the National Center for Atmospheric Research in Colorado, according to a senior White House official, taking aim at one of the world's leading climate research labs.
Trump moves to dismantle major US climate research center in Colorado
The Trump administration is breaking up the National Center for Atmospheric Research, taking aim at one of the world's leading climate research labs.
bit.ly
December 17, 2025 at 2:16 AM
This wouldn't just be a national tragedy but a global one. Just mind-boggling vandalism.
Reposted by Charlie Koven
This 15-story data tower in the heart of the Amazon collects vital climate data that is shared with Americans in California and across the country.
The Trump Administration can ignore reality and worsen the climate crisis, but California will never stop fighting for our future.
The Trump Administration can ignore reality and worsen the climate crisis, but California will never stop fighting for our future.
November 15, 2025 at 5:02 PM
This 15-story data tower in the heart of the Amazon collects vital climate data that is shared with Americans in California and across the country.
The Trump Administration can ignore reality and worsen the climate crisis, but California will never stop fighting for our future.
The Trump Administration can ignore reality and worsen the climate crisis, but California will never stop fighting for our future.
Reposted by Charlie Koven
1/2
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
November 13, 2025 at 12:16 AM
1/2
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
Reposted by Charlie Koven
How can we explore the future of the world's forests? Understanding the demography of their trees is key. In We took the new gen of global demographic vegetation models and held their roots to the observations. Thanks @annemarie-es.bsky.social for leading! nph.onlinelibrary.wiley.com/doi/10.1111/...
October 27, 2025 at 7:12 AM
How can we explore the future of the world's forests? Understanding the demography of their trees is key. In We took the new gen of global demographic vegetation models and held their roots to the observations. Thanks @annemarie-es.bsky.social for leading! nph.onlinelibrary.wiley.com/doi/10.1111/...
Reposted by Charlie Koven
MAJOR NEWS: @GavinNewsom signed SB 79, my bill allowing more housing near public transit — rail, subway, rapid bus.
It’s a huge step for housing in California. It’ll create more homes, strengthen our transit systems & reduce traffic & carbon emissions.
Thank you, Governor!
It’s a huge step for housing in California. It’ll create more homes, strengthen our transit systems & reduce traffic & carbon emissions.
Thank you, Governor!
October 10, 2025 at 4:37 PM
MAJOR NEWS: @GavinNewsom signed SB 79, my bill allowing more housing near public transit — rail, subway, rapid bus.
It’s a huge step for housing in California. It’ll create more homes, strengthen our transit systems & reduce traffic & carbon emissions.
Thank you, Governor!
It’s a huge step for housing in California. It’ll create more homes, strengthen our transit systems & reduce traffic & carbon emissions.
Thank you, Governor!
Reposted by Charlie Koven
Strong statement today from UC's Academic Senate:
October 3, 2025 at 9:58 PM
Strong statement today from UC's Academic Senate:
Mr. Bob is a true local hero of street safety, and it is so infuriating that he was attacked in this latest instance of senseless car violence. I really hope he makes a full recovery.
Many people were concerned when Robert Clear didn't show up for AM drop-off at Emerson Elementary on Tuesday. As it turned out, he had been just blocks away when police say a driver intentionally struck him after running down two other people in the neighborhood.
After bike collision, Berkeley school rallies around 'Mr. Bob'
"He's always here," said Rachel Terp, Emerson PTA president. "I never saw him miss a day."
www.berkeleyscanner.com
September 19, 2025 at 5:23 PM
Mr. Bob is a true local hero of street safety, and it is so infuriating that he was attacked in this latest instance of senseless car violence. I really hope he makes a full recovery.
Reposted by Charlie Koven
Our finalised paper on flat10MIP is finally up in GMD! This is the experimental protocol which allows for a simple, emissions-driven evaluation of TCRE, ZEC and climate reversibility in CMIP7. Thanks so much to all who ran these simulations as a proof of concept! gmd.copernicus.org/articles/18/...
flat10MIP: an emissions-driven experiment to diagnose the climate response to positive, zero and negative CO2 emissions
Abstract. The proportionality between global mean temperature and cumulative emissions of CO2 predicted in Earth system models (ESMs) is the foundation of carbon budgeting frameworks. Deviations from ...
gmd.copernicus.org
September 8, 2025 at 9:56 AM
Our finalised paper on flat10MIP is finally up in GMD! This is the experimental protocol which allows for a simple, emissions-driven evaluation of TCRE, ZEC and climate reversibility in CMIP7. Thanks so much to all who ran these simulations as a proof of concept! gmd.copernicus.org/articles/18/...
Reposted by Charlie Koven
I'm happy to share a paper in Science Advances that makes the case for a weak land carbon sink, drawing upon JPL and Chloris biomass time series. To close the budget with a net land sink of 0.8 Pg C/y from 2000-2019, we propose increases in the ocean sink and decreases in fossil fuel emissions.
September 10, 2025 at 8:01 PM
I'm happy to share a paper in Science Advances that makes the case for a weak land carbon sink, drawing upon JPL and Chloris biomass time series. To close the budget with a net land sink of 0.8 Pg C/y from 2000-2019, we propose increases in the ocean sink and decreases in fossil fuel emissions.
Really excited to see the flat10MIP paper out! Since the preprint, we've added this new figure, showing the ESM ensemble of warming—normalized by the warming at year 100, to remove the uncertainty due to differing TCRE across models—versus cumulative CO2 emissions in the esm-flat10-cdr experiment.
September 5, 2025 at 5:29 PM
Really excited to see the flat10MIP paper out! Since the preprint, we've added this new figure, showing the ESM ensemble of warming—normalized by the warming at year 100, to remove the uncertainty due to differing TCRE across models—versus cumulative CO2 emissions in the esm-flat10-cdr experiment.