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
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.
Reposted by Charlie Koven
The #IPCC has announced the authors selected for its Seventh Assessment Report.
664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.
🌍 51% from developing countries
🚺 46% women
🔗 bit.ly/AR7AuthorsPR
664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.
🌍 51% from developing countries
🚺 46% women
🔗 bit.ly/AR7AuthorsPR
August 18, 2025 at 1:09 PM
The #IPCC has announced the authors selected for its Seventh Assessment Report.
664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.
🌍 51% from developing countries
🚺 46% women
🔗 bit.ly/AR7AuthorsPR
664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.
🌍 51% from developing countries
🚺 46% women
🔗 bit.ly/AR7AuthorsPR
This is such a loss. I've served on the selection committee for this program for the past three years, because it has funded so many incredible people doing such important research over the years. It should be expanding to meet the new challenges of climate change, but instead is totally defunded.
Recipients of a U.S. Climate Science Fellowship Are Put on Unpaid Leave
www.nytimes.com
July 9, 2025 at 8:22 PM
This is such a loss. I've served on the selection committee for this program for the past three years, because it has funded so many incredible people doing such important research over the years. It should be expanding to meet the new challenges of climate change, but instead is totally defunded.
Reposted by Charlie Koven
As of today, all current NOAA Climate and Global Change postdoctoral fellows have been furloughed due to the Dept of Commerce not releasing the funding for the program. In addition no new Fellows were awarded this year. cpaess.ucar.edu/cgc
NOAA Climate & Global Change (C&GC) Postdoctoral Program | Cooperative Programs for the Advancement of Earth System ScienceNOAA Climate & Global Change (C&GC) Postdoctoral Program | Cooperative Progra...
cpaess.ucar.edu
July 7, 2025 at 3:16 PM
As of today, all current NOAA Climate and Global Change postdoctoral fellows have been furloughed due to the Dept of Commerce not releasing the funding for the program. In addition no new Fellows were awarded this year. cpaess.ucar.edu/cgc
Reposted by Charlie Koven
If they close all these research labs, you can't just undo it four years later.
Decades of expertise and tons of specialized equipment will be scattered to the wind. Rebuilding would take ages.
Decades of expertise and tons of specialized equipment will be scattered to the wind. Rebuilding would take ages.
Proposed NOAA budget zeros out ALL climate laboratories and cooperative institutions.
GFDL, NSSL, GML, etc.
This appears to also end the US greenhouse gas sampling network, including at Mauna Loa, the oldest continuous carbon dioxide monitoring site on Earth.
www.commerce.gov/sites/defaul...
GFDL, NSSL, GML, etc.
This appears to also end the US greenhouse gas sampling network, including at Mauna Loa, the oldest continuous carbon dioxide monitoring site on Earth.
www.commerce.gov/sites/defaul...
July 1, 2025 at 1:13 PM
If they close all these research labs, you can't just undo it four years later.
Decades of expertise and tons of specialized equipment will be scattered to the wind. Rebuilding would take ages.
Decades of expertise and tons of specialized equipment will be scattered to the wind. Rebuilding would take ages.
Reposted by Charlie Koven
The Senate version of GOP's budget bill dropped in the middle of the night. Astonishingly, it got EVEN WORSE. It raises energy costs, kills $100s of billions of investment in manufacturing, makes grids less reliable, increases pollution & constrains our ability to compete w/China on AI. Loser stuff.
June 28, 2025 at 3:51 PM
The Senate version of GOP's budget bill dropped in the middle of the night. Astonishingly, it got EVEN WORSE. It raises energy costs, kills $100s of billions of investment in manufacturing, makes grids less reliable, increases pollution & constrains our ability to compete w/China on AI. Loser stuff.
Reposted by Charlie Koven
In case you’re interested in what’s targeted for termination in the Department of Energy budget, it looks like it is the entire environmental half of Biological and Environmental Research:
June 1, 2025 at 1:39 PM
In case you’re interested in what’s targeted for termination in the Department of Energy budget, it looks like it is the entire environmental half of Biological and Environmental Research:
Reposted by Charlie Koven
This is a seismic gut punch to the weather enterprise.
It is impossible to overstate how important @unidata.bsky.social is in implementing many datasets/libraries (LDM, netCDF, THREDDS, metPy) we currently use in meteorological research & operations.
www.unidata.ucar.edu/blogs/news/e...
It is impossible to overstate how important @unidata.bsky.social is in implementing many datasets/libraries (LDM, netCDF, THREDDS, metPy) we currently use in meteorological research & operations.
www.unidata.ucar.edu/blogs/news/e...
NSF Unidata Pause in Most Operations
www.unidata.ucar.edu
May 9, 2025 at 3:50 PM
This is a seismic gut punch to the weather enterprise.
It is impossible to overstate how important @unidata.bsky.social is in implementing many datasets/libraries (LDM, netCDF, THREDDS, metPy) we currently use in meteorological research & operations.
www.unidata.ucar.edu/blogs/news/e...
It is impossible to overstate how important @unidata.bsky.social is in implementing many datasets/libraries (LDM, netCDF, THREDDS, metPy) we currently use in meteorological research & operations.
www.unidata.ucar.edu/blogs/news/e...
Reposted by Charlie Koven
These ‘let’s attract the hot-shot researchers’ calls ring very hollow to me. Climate science is a team sport. It takes a whole set of skills. We need to be thinking about how to keep critical -teams- integrated. Nabbing hero-model scientist types is not going to retain institutional expertise.
Countries that are able would be stupid not to try to attract top US researchers. But because other countries have a very limited capacity, it means that only the most high-profile researchers who can relocate will be able to continue their careers.
UK to launch scheme to recruit global research talent after Trump crackdown
Initiative backed by £50mn in government money comes as US administration seeks to cut funding and suppress research
on.ft.com
May 3, 2025 at 1:56 PM
These ‘let’s attract the hot-shot researchers’ calls ring very hollow to me. Climate science is a team sport. It takes a whole set of skills. We need to be thinking about how to keep critical -teams- integrated. Nabbing hero-model scientist types is not going to retain institutional expertise.
Reposted by Charlie Koven
AGU has filed a new lawsuit to prevent the Administration’s dismantling of U.S. scientific agencies.
We’re proud to take this stand with our plaintiffs’ coalition for our federal workforce.
buff.ly/3U56ooz
We’re proud to take this stand with our plaintiffs’ coalition for our federal workforce.
buff.ly/3U56ooz
April 29, 2025 at 12:15 AM
AGU has filed a new lawsuit to prevent the Administration’s dismantling of U.S. scientific agencies.
We’re proud to take this stand with our plaintiffs’ coalition for our federal workforce.
buff.ly/3U56ooz
We’re proud to take this stand with our plaintiffs’ coalition for our federal workforce.
buff.ly/3U56ooz
Reposted by Charlie Koven
Foundation-funded postdoc funding opportunity to work in WA state! Interested in applying to work with me on climate on land or global carbon cycle dynamics? Reach out! Info sessions in May and June, due date June 26. www.wrfseattle.org/grants/wrf-p...
Postdoctoral Fellowships - Washington Research Foundation
Fellowship Details Fellowships include three years of salary support for the postdoc at an eligible research institution in Washington state. The salary for the first year is $80,000, increasing to […...
www.wrfseattle.org
April 28, 2025 at 3:55 PM
Foundation-funded postdoc funding opportunity to work in WA state! Interested in applying to work with me on climate on land or global carbon cycle dynamics? Reach out! Info sessions in May and June, due date June 26. www.wrfseattle.org/grants/wrf-p...
Reposted by Charlie Koven
Reposted by Charlie Koven
The State Department is eliminating the office that oversees global climate negotiations, in another effort to gut U.S. climate action. One official described the move as “just strategically fucking dumb.”
www.politico.com/news/2025/04...
www.politico.com/news/2025/04...
Rubio eliminates office that oversees climate talks
The Office of Global Change was notified Thursday that it would be shuttered.
www.politico.com
April 24, 2025 at 11:54 PM
The State Department is eliminating the office that oversees global climate negotiations, in another effort to gut U.S. climate action. One official described the move as “just strategically fucking dumb.”
www.politico.com/news/2025/04...
www.politico.com/news/2025/04...
Reposted by Charlie Koven
NASA Is Terminating The GISS Lease In Five Weeks
nasawatch.com/personnel-ne...
"NASA’s lease of Columbia University’s Armstrong Hall in New York City, home to the Goddard Institute for Space Studies, will end effective May 31, 2025."
nasawatch.com/personnel-ne...
"NASA’s lease of Columbia University’s Armstrong Hall in New York City, home to the Goddard Institute for Space Studies, will end effective May 31, 2025."
NASA Is Terminating The GISS Lease In Five Weeks
This was just sent to all NASA Goddard and GISS employees by Makenzie Lystrup
nasawatch.com
April 24, 2025 at 4:18 PM
NASA Is Terminating The GISS Lease In Five Weeks
nasawatch.com/personnel-ne...
"NASA’s lease of Columbia University’s Armstrong Hall in New York City, home to the Goddard Institute for Space Studies, will end effective May 31, 2025."
nasawatch.com/personnel-ne...
"NASA’s lease of Columbia University’s Armstrong Hall in New York City, home to the Goddard Institute for Space Studies, will end effective May 31, 2025."
Reposted by Charlie Koven
The land grant university system, the research university innovation engine, the national lab system, America perfected these. They are as American as apple pie. We don’t have a king. These are America’s Crown Jewels.
April 19, 2025 at 11:28 PM
The land grant university system, the research university innovation engine, the national lab system, America perfected these. They are as American as apple pie. We don’t have a king. These are America’s Crown Jewels.
Saw Kraftwerk play at the Berkeley Greek Theater last night, which happens to be right in front of the @nersc.bsky.social computers, on which I happen to have some global carbon cycle simulations running at the moment. Fun intersection of different computer worlds!
April 19, 2025 at 3:30 PM
Saw Kraftwerk play at the Berkeley Greek Theater last night, which happens to be right in front of the @nersc.bsky.social computers, on which I happen to have some global carbon cycle simulations running at the moment. Fun intersection of different computer worlds!
Reposted by Charlie Koven
A record increase in atmospheric CO2 according to data released by NOAA gml.noaa.gov/ccgg/trends/..., much higher than projected in the Global Carbon Budget essd.copernicus.org/articles/17/....
This occurred in the presence of an El Niño (red bars, data also from NOAA!).
What does this mean?
1/
This occurred in the presence of an El Niño (red bars, data also from NOAA!).
What does this mean?
1/
April 15, 2025 at 7:08 AM
A record increase in atmospheric CO2 according to data released by NOAA gml.noaa.gov/ccgg/trends/..., much higher than projected in the Global Carbon Budget essd.copernicus.org/articles/17/....
This occurred in the presence of an El Niño (red bars, data also from NOAA!).
What does this mean?
1/
This occurred in the presence of an El Niño (red bars, data also from NOAA!).
What does this mean?
1/