Two new books serve as guides to the latest tactic against climate change: geoengineering, the act of deliberately manipulating Earth's climate to cool it down (see story on Page 16).rnKintisch, a reporter for the journal Science, dubs geoengineering "planet-hacking." It's an apt description for sci-fi-sounding fixes, such as spewing sulfur particles into the atmosphere or build-rning carbon dioxide-sucking machines.
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