Photo: 5 Last-Ditch Schemes to Avert Warming Disaster



Lava erupts from Hawaii's Kilauea volcano in January 2004.

Artificially launching sulfur droplets into the atmosphere, as volcanic eruptions naturally do, is one potentially effective way to cool the planet, according to a September 2009 study by a major scientific body—the first to seriously consider such "geoengineering" proposals.

Photograph by David Jordan/AP


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