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John Holdren

Colorado Springs
As seen in: Medium, Forbes, The Guardian, WIRED Magazine, Educational Studies, PNAS, Scientific American, The Hill, The Boston Globe, Baltimore Sun and
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Articles

On Enriched Uranium and (Iranian) Nuclear Bombs

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By John Holdren
| Belfer Center
The Iran War Explainer from Belfer Center for Science and International Affairs How quickly could Iran enrich the uranium it needs to build a nuclear bomb? To answer this question, physicist John Holdren explains how uranium enrichment works, as well as Iran's likely enrichment capabilities. Open Access Published: May. 6, 2026 Atomic Energy Organization of Iran via AP, File This photo released Nov.
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Notes on the Recent Hype about Imminence of Commercial Fusion Energy

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By John Holdren
| Belfer Center
Originally published in June 2024 and updated in January 2026. My views on the current state of development of fusion-energy science and technology are at odds with the last few years’ breathless publicity about fusion breakthroughs of a scale that could mean achievement of commercial energy from fusion in the next 10-20 years.
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Trump will leave climate science in smoking ruins – and the economy will suffer for it  - Land and Climate Review

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By John Holdren
| Land and Climate Review
This article is an edited excerpt from John Holdren’s interview with Bertie Harrison-Broninski for the Land and Climate Podcast, originally broadcast on the 4th July 2025. Listen below: President Trump previously pledged not to cut Medicaid, not to reduce access to health insurance, and not to increase national debt. Now, he has done all the above. His ‘Big Beautiful Bill’, passed on 4th July, is really the ‘Budget-Busting Bill’.
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