DAVID KEITH is planning one of the first real-world geoengineering experiments next year. Only a decade ago, the idea that we might try to reverse global warming by artificially cooling the atmosphere seemed fanciful and dangerous.Tomost, it still does, but with the world on track for 3.6°C of warming even if governments stick to all their promises (see "Can we limit warming to 2°C", page 34), researchers say we should at least understand what plan B looks like.
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