Emily Williams

US repeals key ‘endangerment finding’ that climate change is a public threat Overturning the 2009 decision means billions of extra tonnes of greenhouse-gas emissions over the next three decades.

Today’s action “is a rejection of the most basic laws of physics”, says #climate scientist Friederike Otto.

I report on the EPA revoking its own ruling on the danger of greenhouse gases:

www.nature.com/articles/d41... 🧪

While Zillow is removing its climate risk data from public view, the first truly open climate risk database.

Kudos, @carbonplan.org

A Secret Panel to Question Climate Science Was Unlawful, Judge Rules

"A federal judge on Friday ruled the Energy Department violated the law when Secretary Chris Wright handpicked five researchers who reject the scientific consensus on climate change to work in secret on a sweeping government report on global warming."

Gift link.

Climate Data Scientist | Climate Central Climate Central is seeking a highly-skilled Climate Data Scientist to join our team. Reporting to the Vice President for Science, the scientist will be part of a new initiative in climate services to ...

Very exciting to share that @climatecentral.org is hiring a Climate Data Scientist to join a new climate services effort focused on advancing predictions of risks and hazards on seasonal-to-decadal timescales. The application closes on February 9, 2026 at 5pm ET, & the description can be found here:

I don't know how to do this But I'm going to keep doing it anyway.

Wrote myself a pep talk to get back to work tomorrow. It helped me. Hope it helps you.

No problem, and sorry I wasn't able to meet you in person! Fun side note -- my mom loves geology so I gave her one of your volcano tissue boxes for Christmas (she loved it)!

E.P.A. to Stop Considering Lives Saved by Limiting Air Pollution In a reversal, the agency plans to calculate only the cost to industry when setting pollution limits, and not the monetary value of saving human lives, documents show.

Breaking News: The EPA will stop considering lives saved when setting pollution limits and instead calculate only the cost to businesses.

New in @globalchangebio.bsky.social: thoughts from me & Jilmarie Stephens on recent study confirming that vegetation accumulation-to-desiccation cycles induced by wet-to-dry climate transitions increase wildfire severity in California's non-forested biomes. onlinelibrary.wiley....

And now there's officially a Tornado Warning out for Santa Cruz County for this offshore mini-supercell thunderstorm, which is likely producing a waterspout over water that could move inland as a tornado near Santa Cruz. #CAwx

The next National Climate Assessment will be written by five climate deniers and an AI in a trench coat.

Please read

www.forbes.com/sites/marsha...

🚨 Calling all geoscientists 🚨 If you or anyone you know is attending #AGU25, please join us and spread the word to #SaveNCAR.

More info at: wclivestream.com/ncar_at_agu/

Unbelievable. This would be a terrible blow to American science, writ large. It would decimate not only climate research, but also the kind of weather, wildfire, and disaster research that has underpinned half a century of progress in prediction, early warning, and increased resilience.

If you're at #AGU25 next week, hope to see you there!

carbon majors and the scientific case for climate liability

Next week at #AGU25. GC14C-06, Monday at 5:10.

A number of new estimates of current policy warming by 2100 have been released in recent months, including three prominent ones from UNEP, IEA, and CAT in the run-up to COP30.

I've got a new piece over at The Climate Brink digging into the details: www.theclimatebrink....

Fossil fuel lobbyists outnumber all Cop30 delegations except Brazil, report says One in every 25 participants at 2025 UN climate summit is a fossil fuel lobbyist, according to Kick Big Polluters Out

And yet we keep wondering why these conferences don’t get anywhere

www.theguardian.com/environment/...

For rural Californians, unreliable power has become the norm - High Country News Years ago, the state’s largest utility rolled out a power outage program designed to reduce wildfires. Customers now experience thousands of outages a year.

This is a fantastic article on the reliability compromises that are being created by wildfire safety interventions in rural California. A must read. www.hcn.org/issues/57-11...

Map of US with purple and blue icons over central US indicating severe weather billion dollar disaster events in 2025 and one fire in LA.

The Billion Dollar Weather and Climate Disaster dataset is back and now at @climatecentral.org!

Through the first half of 2025, there were 14 separate billion-dollar weather and climate disasters across the United States, costing $101.4 billion. 1/2
www.climatecentral.org/climate-serv...

It's finally here! 100+ scholars, global scope, practical insights. “Climate Obstruction: A Global Assessment” shows how organized interests stall policy—and how governance can respond.

Open access available now! Or order for paperback and hardcover. cssn.org/wp-content/u...

Climate-linked escalation of societally disastrous wildfires Climate change and land mismanagement are creating increasingly fire-prone built and natural environments. However, despite worsening fire seasons, evidence is lacking globally for trends in socially ...

Published today: our new paper showing a 44-year trend of increasing global wildfire disasters (fatalities and economic losses) due to climate change-induced extreme weather. www.science.org/doi/10.1126/...

Agreed, it was a great one! We got a Monday afternoon slot this year, though, which feels better.

Screenshot of an ESS Open Archive preprint page. A green “Download PDF” button sits at top left. The title reads “Climate Experts’ Review of the DOE Climate Working Group Report.” Below are subject tags “Atmospheric Sciences” and “Climate Science,” followed by two listed authors. A “Preprint timeline” box shows “Submitted to ESS Open Archive” on 24 Sep 2025 and “Published in ESS Open Archive” on 29 Sep 2025. A citation block includes the DOI 10.22541/essoar.175745244.41950365/v2 and notes version v2 (processing). A right-side box says “Non-exclusive” and “No reuse.” A yellow banner at the bottom states: “This is a preprint and has not been peer reviewed. Data may be preliminary.”

Our comment to the DOE and EPA about the DOE Climate Working Group report is now posted on ESSOAR preprint server. It has a DOI and can now be cited!

essopenarchive.org/users/260056...

Scientists link hundreds of severe heat waves to fossil fuel producers' pollution A new study finds dozens of heat waves would be "virtually impossible" without the activity of major fossil fuel producers, including oil companies.

A new study finds dozens of heat waves would be "virtually impossible" without the activity of major fossil fuel producers, including oil companies.

Dozens of scientists find errors in a new Energy Department climate report More than 85 scientists say that a recent U.S. Department of Energy report is full of errors and misrepresents climate science.

More than 85 scientists say that a recent U.S. Department of Energy report is full of errors and misrepresents climate science.

Grateful to @andrewdessler.com for coordinating this (and keeping us on schedule)! I feel proud for having contributed to this monumental effort alongside some of my role models in this field. It felt necessary to respond to the report that was misleading at best and dangerous at worst.

Our 400+ page comment on the DOE climate working group report is now out.

Our conclusion: The merchants of doubt are back, and they're coming for climate science.

The Department of Energy hired five academics to raise doubts about climate change. 85+ climate experts (organized by @andrewdessler.com) reviewed their report. Our conclusion, detailed in 450 pages of analysis: it is biased, full of errors, and not fit to inform policy making.

Thanks to the Guardian for covering our efforts.
Read more here: www.theguardian.com/environment/...
Follow us, support the mission, and help keep climate truth alive.

Climate.gov will re-launch under new URL thanks to a secret team of web ninjas | CNN A small group of writers and researchers are launching an ambitious effort to preserve key climate data that the Trump administration has taken offline, including the climate.gov website.

New nonprofit climate group forms, aims to resurrect climate.gov, National Climate Assessment and other lost data www.cnn.com/2025/08/28/c...