Engineering a cooler Earth

Researchers brainstorm radical ways to counter climate change

By Erika Engelhaupt, 09:04 AM May 20, 2010

None of the scientists in the room so much as blinked when David Keith suggested saving the world with spy planes spraying sulfuric acid.

Keith, a physicist at the University of Calgary in Canada, was facing an audience not likely to be shocked: nearly 200 other researchers, some of whom had their own radical ideas for fighting global warming. His concept was to spray a mist of sulfuric acid high in the stratosphere to form particles called sulfate aerosols, which would act like a sprinkling ...

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