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The Big Idea
Posted Jul 15,2009
If we don’t cut fossil fuels fast enough, global warming may get out of hand. Some scientists say we need a plan B: a giant sunshade that would cool the whole planet.
“If a country starts thinking it’s in their vital interests to do this, and they have the power, I find it hard to imagine them not doing it,” says Ken Caldeira, a climate expert at the Carnegie Institution.
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