It's easy to argue about the hypothetical causes and effects of global warming. It's a lot harder for any serious disagreement to continue when extreme weather is demolishing a major American city. The U.S. experienced just such a moment of clarity last year when Hurricane Katrina laid waste to New Orleans, awakening all of us to the true cost of climate change. It was Kerry Emanuel, an atmospheric scientist at the Massachusetts Institute of Technology, who helped us make the connection.
Less than a month before Katrina hit, the journal Nature published an extensive study that Emanuel had conducted in which...
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