https://www.americaspace.com/tag/john-holdren/
John Holdren - AmericaSpace
john holdren
https://buzzle.com/science/obama-climate-adviser-john-holdren-geo-engineering-could-be-used-to-tackle-global-warming
Obama Climate Adviser John Holdren: Geo-engineering Could Be Used to Tackle Global Warming | Buzzle
Jul 28, 2026 - Obama’s science adviser John Holdren says geo-engineering options like space mirrors and cloud seeding merit study as climate fixes.
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