On May 18–19, the UChicago Climate Systems Engineering initiative is bringing together researchers, policymakers, and practitioners for a public symposium we're calling "Frontiers in Climate Systems Engineering.” The goal is simple: rigorous analysis and open debate.

Enjoyed my conversation on SRM360's webinar/pod yesterday. Check it out here:

Live Discussion: Are Emissions Cuts on Track to Avoid Catastrophic Impacts?

Watch the recording of SRM360's live discussion on emissions cuts, projections, and the potential role of solar geoengineering (SRM).

srm360.org

Daniele Visioni and I explain our concerns about Stardust and the commercialization of climate engineering in Technology Review:

Why the for-profit race into solar geoengineering is bad for science and public trust

Two scientists argue that the growing commercial efforts to counter climate change by reflecting away sunlight will thwart responsible research in the field.

technologyreview.com

Notice how much Ray leans on ad hominem arguments. Calling me a charlatan. So what. It's not about me or Ray. People typically resort to ad hominem attacks when their factual and ethical arguments are weak. Ray: you should do better.

Zeke's sweet thread on our op-ed:

Zeke Hausfather@zekehausfather.com · 11mo ago

I have a new @nytimes.com guest essay w/ @davidkeith.bsky.social about sunlight reflection. We note its not a solution for climate change and at best a band aid to treat systems, and suggest if its ever done it should only be to replace the cooling from air pollution today:

Zeke Hausfather and I have an NYT op-ed out today, www.nytimes.com/2025... Here's my short blog post on the topic: davidkeith.earth/pre... 1/4

Opinion | A Responsible Way to Cool the Planet

A small, carefully scaled geoengineering program could compensate for the loss of cooling as we eliminate sulfur pollution.

nytimes.com

Research on sunlight reflection is often driven by large or badly managed deployments. Ken Caldeira, Cael, and I invite submissions for an AGU session assessing potential harms from limited deployment. agu.confex.com/agu/agu25/pr...

Enjoyed my time in Cape Town last month for the Degrees Forum 2025. I had the pleasure of joining @hollyjeanbuck.bsky.social and Rose Mutiso for a plenary session on how sunlight reflection methods (SRM) fit into the broader climate response toolbox. #DGF2025 youtu.be/jlUQl6YjIjc...

Fitting SRM into the wider landscape

Holly Buck led a session with Rose Mutiso and David Keith focused on how SRM fits into broader discussions of climate change solutions. The session began with a survey, engaging the audience to explore their own thoughts about SRM in the context of CDR, adaptation, and mitigation. Mutiso noted that

youtu.be

Can Canada afford to ignore sunlight reflection methods (SRM)? I'm joining @ldilling.bsky.social from the @envdefensefund.bsky.social for a discussion hosted by the Transition Accelerator, a major Canadian NGO focused on the climate. June 10, 12pm ET. Join the Live Q&A: transitionaccelerato...

Can We Afford to Ignore Solar Geoengineering?

Should Canada act now to build its SRM research capacity and leadership? How can we foster the local expertise and international partnerships we’ll need to control the technology should solar geoengineering become a reality?

transitionaccelerator.ca

Superb op-ed from Steven Pinker (@sapinker on X) calling out the right's absurd Harvard Derangement Syndrome. Harvard has some woke, but its peak has passed, and claims of many on the right are disconnected from the reality I saw as a faculty member. www.nytimes.com/2025...

I appreciate the way Andreas has made a careful case for strong actions such as civil disobedience to protect humans and nature. Looking fwd having Andreas join us on Energy vs Climate this morning. (Feel free to join us live) www.energyvsclimate....

You're Invited: Has the World Surrendered to Climate Breakdown? Andreas Malm, author of "How to Blow Up a Pipeline," on EvC May 23 at 10AM ET

"The climate crisis calls not for moderation, but for militant action." - Andreas Malm Join us for a live recording of Energy vs Climate with special guest Andreas Malm, author of How the World Surrendered to Climate Breakdown and How to Blow Up a Pipeline: Learning to Fight in a

energyvsclimate.com

Smart argument against a moratorium for deployment of sunlight reflection SRM from Sue Biniaz (former top US climate negotiator) and @bodansk.bsky.social (environmental lawyer). www.justsecurity.org...

Why Global “Moratorium” on SRM Deployment Should Get a Chilly Reception

A bottom-up norm-setting approach would rectify the concerns of agreeing to a global moratorium on solar radiation management deployment.

justsecurity.org

New high-quality survey on public attitudes toward sunlight reflection in Great Britain: 16% support SAI deployment. 46% are unsure. Younger people are more supportive overall. Interesting signals on awareness and openness to geoengineering in general. yougov.co.uk/health/...

Dimming the sun; brightening clouds; planting forests: would Britons support geoengineering to combat climate change? | YouGov

Most Britons say a drastic change in the steps taken to combat climate change is needed in order to avert its worst effects

yougov.co.uk

Terraforming makes me squirm. I don't want to see humans messing with another planet until we have done a much better job protecting Earth's environment.

Is Global Cooperation on Climate Change Possible? An interesting conversation with Former Foreign Minister of Pakistan @HinaRKhar, former lead U.S. climate negotiator Sue Biniaz, and former climate advisor to Trump George Banks, moderated by Amy Harder. youtu.be/scYZzq3zVm0...

Is Global Cooperation on Climate Change Possible?

Experts debated the future of US climate diplomacy at an Institute event titled “Is Global Cooperation on Climate Change Possible?” on May 1. The panel featured former Foreign Minister of Pakistan Hina Rabbani Khar, former lead US climate lawyer and Principal Deputy Special Envoy for Climate Sue Bin

youtu.be

Will CO2 emissions peak this year? Mainstream forecasters like @IEA, @RystadEnergy, @McKinsey, and @DNV_Group Det Norske Veritas suggest a peak in the next year or so. Climate advocates seem reluctant to embrace this good news. What do you think? Why might these forcasts be wrong?

Excited to be in Cape Town for degreesglobalforum.org/ I last visited this part of the world in 1990, when I ended up in Mozambique during the civil war. Despite all the troubles, it's a different (mostly better) world now. Ping me for meetings.

Degrees Global Forum

The 2025 Degrees Global Forum on SRM will be the largest conference to date on solar radiation modification (SRM).

degreesglobalforum.org

Excited to be on the RBC Disruptors podcast to discuss carbon removal and direct air capture. I did my best to deconstruct the mantra that we need to cut 10 billion tons of carbon emissions a year by 2050. thoughtleadership.rb...

Beyond Offsets: How to Build a Carbon Removal Industry - RBC Thought Leadership

Carbon offsets aren’t enough. To truly tackle climate change, we need a global industry dedicated to pulling carbon out of the air and at massive scale.

thoughtleadership.rbc.com

"Donald Trump Tries to Run Harvard", here's an extract from this morning's op-ed in the woke Wall Street Journal:

David Keith@davidkeith.bsky.social · last yr.

Trump's demands of Harvard are authoritarian. I am proud of Harvard's response. Harvard and similar universities have a problem with insufficient diversity of political viewpoints -- but government power over hiring and speech is precisely the wrong answer. 1/5

25 days to go until #DGF2025... Rose Mutiso, @davidkeith.bsky.social and @hollyjeanbuck.bsky.social will be exploring how SRM fits into the wider landscape of climate mitigation, including direct air capture, adaptation and emission reductions: degreesglobalforum.org/sessions/fit...

Fitting SRM into the wider landscape

degreesglobalforum.org

Trump's demands of Harvard are authoritarian. I am proud of Harvard's response. Harvard and similar universities have a problem with insufficient diversity of political viewpoints -- but government power over hiring and speech is precisely the wrong answer. 1/5

Hey Yanks, here is something Canadian you can envy: the opportunity to buy a Mooshead Presidential Pack, 1,461 beers, getting you through Trump, one beer per day of a presidential term. It started as a joke, but they are selling them. mooseheadbeershop.ca...

The Presidential Pack

1,461 473mL cans of Moosehead. Just enough Canadian Lagers to get through a full presidential term.   The Presidential Pack is only available to customers in NB, NS, & ON. Beverage container deposit & applicable taxes applied at checkout. Please enjoy responsibly. 

mooseheadbeershop.ca

Good article by @catclifford.bsky.social on our work comparing some of the risks and benefits of sulfate aerosol sunlight reflection. www.ciphernews.com/a... 1/3

Terrific and Topical EnergyVSClimate with @jessedjenkins.com www.energyvsclimate....

NEW EPISODE: The USA vs Climate - Trump's New Climate & Energy Policy with Dr. Jesse Jenkins

Trump's New Climate & Energy Policy with Dr. Jesse Jenkins, energy systems expert and professor at Princeton University. It's a lively discussion about the substantial changes to U.S. climate and energy policy under the Trump administration. Jesse, David and Ed break down the key policy reversals, their impact on U.

energyvsclimate.com

I was sitting in NOAA's Boulder lab today when people got fired. Tears in the hallway. Security escort. They fired a great young scientist. Beyond the anti-science nonsense, letting smart & cheap new hires go is an incompetent way to cut costs. www.nytimes.com/2025/02/27/c...

Mass Layoffs Begin at NOAA

The cuts came just before a separate wave of departures was expected under the Trump administration’s so-called deferred resignation program.

nytimes.com

Article on the White Sky paper: cen.acs.org/environment/...

How solar geoengineering may change our skies

A new study simulates how the sky might look to the casual observer after stratospheric aerosol injection

cen.acs.org

David Keith@davidkeith.bsky.social · last yr.

Under a not so white sky: visual impacts of stratospheric aerosol injection New paper out today by Ansar Lemon TLDR: casual observers would not notice anything different about the sky in a world cooled 1 C with stratospheric sulfates. iopscience.iop.org/a... 1/6

Home in Canada, feeling the cold anger against the treaty-breaking yanks. On Sunday we fantasized about Hydro Quebec pulling the plug on 2.5 GW of power flowing south during the big game. Retool the '80's AB bumper sticker (image): Eastern -> Southern

Good article on glacial interventions: www.independent.co.u... It does a nice job summarizing options. FYI: see the "Research Vission" whitepaper from UChicago: climateengineering.u... 1/2

Scientists have some out-of-the-box ideas to save the ice caps

Scientists say glacier engineering could be a potential stopgap as the Earth passes a critical climate milestone. Others aren’t as convinced

independent.co.uk

Under a not so white sky: visual impacts of stratospheric aerosol injection New paper out today by Ansar Lemon TLDR: casual observers would not notice anything different about the sky in a world cooled 1 C with stratospheric sulfates. iopscience.iop.org/a... 1/6

My solution: Trudeau vs Trump in the ring. As a Candian, I am super pissed at this yank lunacy. This is going to put a lot of folks out of work. (FYI, this Trudeau vs Brazeau boxing match helped Trudeau win the leadership.) www.youtube.com/watc... 1/2

Justin Trudeau -- Patrick Brazeau Charity Boxing Match -- English Coverage of Complete Fight

The fight took place at the Hampton Inn Convention Centre in Ottawa on March 31, 2012. It was a bout for the cancer charity Fight for the Cure. Live coverage in English was provided by Sun News Network. Watch Brazeau get booed for saying Trudeau hadn't managed to get him down (about the 15:05 mar

youtube.com