In the contiguous US, for every 10 heat records, there are ~7 cold records, but between 2015 and 2025, this drops to just ~2 cold records for every 10 heat records. THIS chart 📊 is global #climatechange. #dataviz
There has been a lot of recent interest by companies in mitigating short-lived climate "super-pollutants" like methane and refrigerants. This can have a strong short-term climate impact, but to credibly counterbalance CO2 emissions requires combining them with durable carbon removal.
The growing role of climate-sensitive emissions raises the stakes for reducing methane emissions from the anthropogenic sectors we can directly control. 🌍
www.pnas.org/doi/abs/10.1...
Further, fossil methane emissions appear relatively stable over the past two decades despite rising production. That implies a global decline in methane intensity (less methane released per unit of fossil energy produced) and points to real mitigation progress as well as additional opportunity. ↓
In our recent PNAS paper, we analyze long-term trends in the isotopic composition of atmospheric methane and find recent growth is largely driven by microbial emissions. These increases are consistent with a mix of climate-sensitive wetland emissions and expanding agricultural and waste sources. ↓
Glad to see our group's work featured in this @nytimes.com article on how different methane emission categories are changing over time. 🧵↓
www.nytimes.com/2026/02/18/c...
In our recent PNAS paper, we analyze long-term trends in the isotopic composition of atmospheric methane and find recent growth is largely driven by microbial emissions. These increases are consistent with a mix of climate-sensitive wetland emissions and expanding agricultural and waste sources. ↓
Attention folks in the weather, climate, disaster, wildfire, and Earth science communities: NSF has just published a new "Dear Colleague" letter inviting feedback (by Mar 13) on the proposal to dismantle the National Center for Atmospheric Research (NCAR). www.nsf.gov/funding/...
I just signed - consider signing if you work or have worked in Greenland “We hope many U.S.-based researchers in Greenland …will join us in signing this letter to… call upon our elected representatives to vocally support Greenland’s right to self-governance”. forms.gle/csef7uCnU11y...
"Science Under Siege -- the NCAR Development" | My new commentary: michaelmann.net/science-unde...
#ScienceUnderSiege
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.
Congrats to @benryoung.bsky.social and team for a new publication on methane emissions. They found: 1) The fossil fuel industry is getting better at increasing production but not emissions, and...
With support from the @cires.colorado.edu and @noaa.gov
Excited to share our new PNAS paper!
We find that recent methane growth was driven by agriculture/waste and wetland emissions, while fossil fuel emissions have remained stable despite growth in production, highlighting recent progress and further mitigation potential.
www.pnas.org/doi/abs/10.1...
The order is the latest move by the Trump administration to assert control over US science
go.nature.com/3H6IxVr
So now, regardless of the scientific merit of your grant proposal, a Trump appointee with no specified qualifications gets to decide whether to fund it or not based entirely on how it aligns with the Trump administrations policy goals…seems real bad.
"A climate nonprofit is planning to revive a key federal database tracking billion-dollar weather disasters that the Trump administration formally stopped updating in May.
The database - which was produced by NOAA - is set to return this fall as a product of @climatecentral.org."
A punnet that has only a single cherry in it.
Breaking: US shortage of cherries since so many were picked for the DOE ‘critical’ review of climate science.
Nat Geo would kill for legit science-driven adventure like they found in “For Winter,” over content less credibly grounded in pursuit of knowledge +humans pushing limits. Instead they’ve (Disney?) gotten cold feet & deeply disrespected my colleague Ali & her family. defector.com/why-did-nati...
See interviews from lab alum Ben Riddell-Young and PI Ed Brook in this Mother Jones article on the future of ice core research.
🚨The Trump Administration is proposing devastating cuts to key national agencies in Colorado that play a vital role in protecting our country, including through cutting-edge research on wildfires, droughts, and more.
Senator Bennet and I are fighting back against the attacks on NOAA, CIRES & CIRA 👇🏾
Problems don’t exist if you don’t see them! 😐
Funding for ice core research is at risk. Ben Riddell-Young, a CIRES postdoctoral researcher in NOAA GML, shares why ice core research is important for understanding past and future climate change. “There’s questions that we don’t know we should be asking yet.”
www.motherjones.com/politics/202...
About 20 years ago, researchers drilled a 3,260-meter ice core in East Antarctica. Now, scientists are using it to uncover new insights. 🧪🌊
@noaa.gov just released the 2024 CO2 growth rate and it doesn’t look good. It is more important than ever to continue monitoring how and researching why GHGs are changing and what these changes mean for our climate system.
@climate.noaa.gov
To the world:
We are fighting back. Our movement has been silenced by the media here—but we are not backing down. This is what our streets looked like across multiple cities. Tomorrow, there will be more of us! Raise a glass to freedom.
—With love,
Your American allies.
A screenshot of a text conversation discussing chaotic and troubling conditions at NOAA, expressing concerns about the administration's lack of care and the need for legislative attention.
My friend from the NOAA lab that brings you the Keeling Curve wants that world to know that things are horrible inside NOAA.
We have an exciting opportunity for postdoc to join our group at @bas.ac.uk and take part in two big ice core projects: www.beyondepica.eu and @fetch4.bsky.social.
Package includes: mugs, stickers, maps, trips to Copenhagen, Grenoble and (maybe) Greenland.
bas.ciphr-irecruit.com/applicants/v...
Having fun with new lecture on:
Wendt et al., 2024, Southern Ocean drives multidecadal atmospheric CO₂ rise during Heinrich Stadials | PNAS www.pnas.org/doi/10.1073/...
Riddell-Young et al., 2025, Abrupt changes in biomass burning during the last glacial period | Nature doi.org/10.1038/s415...
