Military planes (or helium balloons) spray the stratosphere with sulfur gases, which disperse and oxidize. The particles scatter back into space some of the sunlight that would have been absorbed by the planet's surface. As more sunlight is deflected, the planet cools. It's like an artificial version of an erupting volcano. ....read more
Copenhagen, Schmopenhagen By Jesse Ellison | NEWSWEEK Published Nov 28, 2009 From the magazine issue dated Dec 7, 2009
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