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David Keith @davidkeith.bsky.social · 23/05/2025

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...

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David Keith @davidkeith.bsky.social · 20/05/2025

But I'm not opposed people thinking about it, and I'm impressed by the arguments and authors who just published a case for Mars terraforming research. Article link: www.nature.com/artic... Open access version: sseh.uchicago.edu/do...

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David Keith @davidkeith.bsky.social · 16/04/2025

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

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David Keith @davidkeith.bsky.social · 15/04/2025

Read the text of what the Trump Administration demands from Harvard, and imagine what this would mean in practice if Harvard caved 2/5

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David Keith @davidkeith.bsky.social · 04/04/2025

See my blog post about the article that includes an FAQ. davidkeith.earth/com... 3/3

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David Keith @davidkeith.bsky.social · 04/04/2025

Nice quote from Govindasamy Bala “A rigorous quantitative risk-risk assessment, like what is done in this paper, is a must before solar geoengineering is ever tested or deployed.” Also, nice graphics 2/3

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David Keith @davidkeith.bsky.social · 04/04/2025

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

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David Keith @davidkeith.bsky.social · 11/02/2025

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

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David Keith @davidkeith.bsky.social · 10/02/2025

Time to move beyond the most simplistic critiques of these ideas. The quote from Jeremy Bassis implies the world is doing nothing to address the root cause when, in fact, spending on clean energy is now 1.7 % of world's economy and emissions are about to peak. 2/2

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David Keith @davidkeith.bsky.social · 06/02/2025

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

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David Keith @davidkeith.bsky.social · 24/01/2025

Three takes on Trump, climate, and solar geoengineering from @JesseLReynolds, Jane Long, and me: srm360.org/perspecti... 1/2

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David Keith @davidkeith.bsky.social · 18/12/2024

A: mortality reduction from cooling is > 10X mortality increase from air pollution and ozone loss caused by SRM sulfate. Benefits are concentrated in warmer regions. Full paper: www.pnas.org/doi/10.... Explanatory post by me and Tony: davidkeith.earth/com.... Questions? 2/2

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David Keith @davidkeith.bsky.social · 18/12/2024

New paper by @tonyharding.bsky.social in PNAS with first quantitative risk-to-risk comparison for solar geoengineering (SRM). Climate has risks that may be reduced by SRM. SRM with sulfates has risks. Q: How do the risks compare? 1/2

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David Keith @davidkeith.bsky.social · 22/11/2024

And finally, if you want my opinion on Make Sunsets, check out this clip from the episode. Enough said. 7/7

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David Keith @davidkeith.bsky.social · 22/11/2024

See: davidkeith.earth/how... 6/7

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David Keith @davidkeith.bsky.social · 22/11/2024

@cbc-news.bsky.social's What on Earth podcast tackles solar geoengineering and @makesunsets.bsky.social. Listen here: www.cbc.ca/listen/li... Some notable takeaways from the episode (read below or check out the clip here). 1/7

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David Keith @davidkeith.bsky.social · 21/11/2024

I'm just a symbol in this regard; the important thing this signals is the growing credibility of research and debate about solar geoengineering. Note that Vox's citation text has little correlation with my views. 2/4

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David Keith @davidkeith.bsky.social · 21/11/2024

See article 3 of treaty text: treaties.un.org/doc/... 2/2

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David Keith @davidkeith.bsky.social · 29/10/2024

Here's the climate engineering panel, which starts at 4:15 Central time. climateengineering.u... 2/2

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David Keith @davidkeith.bsky.social · 28/10/2024

American: "Rase a paw at me, bear, and I will run over and fuck you up. If you even think about growling I will waste you and your scruffy little cubs with my Counter Assault." counterassault.com/ 3/4

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David Keith @davidkeith.bsky.social · 28/10/2024

Canadian: "Eh bear, excuse me. You are over there; I am over here minding my own business. How about you back off a bit while I back off a bit holding this little can of spray? Sorry, excuse me, have a good day" back-offbear.ca/ 2/4

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David Keith @davidkeith.bsky.social · 23/10/2024

"We have the impression that more schemes will be proposed for climate control than for control of the climate controllers." Kellog and Schneider, 1974 in Science Fair point. (10.1126/science.186.4170.1163)

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David Keith @davidkeith.bsky.social · 22/10/2024

Interesting paper: Political ideology and views toward solar geoengineering in the United States More talk of solar geoengineering --> less polarization Also, cool to see Paul @PaulOWennberg playing on the social science court www.cambridge.org/en...

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David Keith @davidkeith.bsky.social · 16/10/2024

Want to write about climate engineering? UChicago's Climate Systems Engineering Initiative is hiring a communications specialist. uchicago.wd5.myworkd...

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David Keith @davidkeith.bsky.social · 15/10/2024

Recently, I had the pleasure of joining the UnLivable Cultures podcast for a debate with Jeroem Oomen on the Solar Geoengineering Non-Use Agreement. The crux of my issue with the agreement is summed up in the following clip from the episode. Full episode here: lnkd.in/dM-GCZwi

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David Keith @davidkeith.bsky.social · 15/10/2024

Section 4.6 on Technical Feasibility I burrowed down into the details of MCB sprayers with help from Armand Neukermans. Our conclusion: the engineering side of MCB is harder than many assumed. Our meta conclusion... 7/8

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David Keith @davidkeith.bsky.social · 15/10/2024

For example, the first review article on stratospheric aerosols was in 1961. More research will help reduce uncertainty — i.e. experiments on aerosol formation in plumes from stratospheric aircraft — but this is refining a deep well of knowledge, not testing a total unknown. 6/8

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David Keith @davidkeith.bsky.social · 15/10/2024

Next, the case for reliability: 5/8

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David Keith @davidkeith.bsky.social · 15/10/2024

I used to emphasize uncertainty and risks. They are real, but there is also a strong case for the reliability of SRM research. See section 5.2 of the paper & these slides. First, reasons to suspect unreliability: 4/8

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David Keith @davidkeith.bsky.social · 15/10/2024

SRM has come a long way in the 1/4 century since my last Ann Rev entry. Literature has grown from a handful of papers to thousands. Here's a fig from Ken & Bala's 2016 paper, wondering if growth would continue. It did, pub rate up 2X since 2014. doi.org/10.1002/2016... 3/8

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David Keith @davidkeith.bsky.social · 15/10/2024

It was a joy to write with my friend Ted, with whom I have debated geoengineering since 1989. And nice to write in Annual Reviews a quarter century after I wrote "History and Prospect", an early and highly cited (;-)) review. davidkeith.earth/pub... 2/8

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David Keith @davidkeith.bsky.social · 15/10/2024

New paper: "Solar Geoengineering: History, Methods, Governance, Prospects" by Ted Parson & me in Annual Reviews. Full text at: davidkeith.earth/pub... I am particularly proud of this paper. This thread provides some highlights: 1/8

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David Keith @davidkeith.bsky.social · 23/09/2024

Opportunity for Postdoctoral Researchers at the Climate Systems Engineering initiative at UChicago! $90k/year salary + $10k/year research funding + research autonomy Work with a mentor from a discipline as part of our growing community. Please forward to your networks.

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David Keith @davidkeith.bsky.social · 09/09/2024

We are bringing @EnergyvsClimate to the Energy Disruptors conference on October 1st and 2nd in Calgary, joining 3000+ attendees and speakers including Former Prime Ministers Jacinda Ardern and Sanna Marin as well as best-selling author Yuval Noah Harari. www.energydisruptors...

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David Keith @davidkeith.bsky.social · 09/09/2024

Why implies both? See my NYT Essay, What’s the Least Bad Way to Cool the Planet? www.nytimes.com/2021... 2/2

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David Keith @davidkeith.bsky.social · 09/09/2024

Question: did the cartoonist realize that "reversing climate change" implies using either carbon removal or solar geoengineering, or both? 1/2

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David Keith @davidkeith.bsky.social · 08/08/2024

Want to know more about stratospheric solar geoengineering? Register for this Stanford event on Thursday, August 8th here: bit.ly/stanford-sai-... Excited to be part of this amazing lineup with Chris Field, Doug MacMartin, Andrew Ng, and Simone Tilmes.

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David Keith @davidkeith.bsky.social · 05/08/2024

Hmm, I returned from the backcountry to find NY Times put a story about me on front page of Sunday's paper. My comment here: davidkeith.earth/com... Feedback and questions are welcome. 1/3

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David Keith @davidkeith.bsky.social · 19/07/2024

In an early (2001) paper, I called for a comparative analysis of the cost and environmental footprint of biomass CDR pathways. Each of the four ways now sees real action and $$$. Analysis of environmental tradeoffs lags behind investments and industry. 5/5

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David Keith @davidkeith.bsky.social · 19/07/2024

Ken's Q was part of a sharp debate from the early days of BECCS Our answer in 2002? It depends... davidkeith.earth/wp-... 3/5

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