Could – and should – we thin clouds to cool the planet?
A solar geoengineering proposal could change how ice crystals form high in the sky. But there are many risks and unknowns.
Thu, Feb 26, 2026
The Harvard Climate Brief brings Harvard faculty expertise on climate change and sustainability to the wider world. Authors’ views are their own. Republish.
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Geoengineering
Understanding and addressing “chemtrails”
In the wake of the coronavirus, people concerned about government control over vaccines and pandemic responses began to organize against geoengineering. A sociologist studying environmental governance explores how to confront their concerns without validating conspiracy thinking.
Wed, Jun 25, 2025
New directions in solar geoengineering research
As researchers consider climate interventions with fewer side effects, a new study asks important questions.
Fri, Feb 7, 2025
All perspectives expressed in the Harvard Climate Brief are those of the authors and not of Harvard University or the Salata Institute for Climate and Sustainability. Any errors are the authors’ own. The Harvard Climate Brief is edited by an interdisciplinary team of Harvard faculty.