Launch myriad mirrors into space to deflect a fraction of sunlight from reaching Earth. Seed the stratosphere with sulfur or other particles to cut some of the sun’s rays. Bioengineer trees to soak up huge amounts of carbon dioxide from the air. Scatter unmanned self-powered ships to roam the world’s oceans funneling sea spray high in the sky to help form protective clouds.
http://features.csmonitor.com/environment/2008/07/16/can-we-engineer-a-cooler-earth/
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