In the absence of political action to cut greenhouse gas emissions, some scientists are starting to seriously consider schemes to mitigate runaway global warming. But big plans to cool the earth, or geoengineering, pose big questions about how and whether we can responsibly manipulate the earth’s natural systems. Host Jeff Young discusses the people and concerns driving the geoengineering debate from Jeff Goodell, author of the new book, How to Cool the Planet.
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