A Big-Sky Plan to Cool the PlanetPumping aerosols into the stratosphere may 
buy us more time, but it’s no substitute for cutting carbon emissions—and 
we still don’t know enough to do it responsibly.
Gernot Wagner and Martin L. Weitzman
Feb. 16, 2018 12:36 p.m. ET

Seriously addressing climate change means cutting carbon emissions and, 
ultimately, reducing the carbon already in the atmosphere. There’s no way 
around it. Another type of intervention, however, is increasingly garnering 
attention: solar geoengineering, that is, cooling the planet by making it 
reflect back more of the sun’s rays. It’s not a permanent solution to 
climate change, and it carries worrisome environmental and political risks 
of its own, but it’s an idea worth exploring.

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