The new version of the map includes 13 zones, with the addition for the first time of zones 12 (50-60 degrees F) and 13 (60-70 degrees F). U.S. Department of Agriculture hide caption

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Altering the upper atmosphere could block enough sunlight to offset the warming effects of climate change and protect food crops. But what are the risks? iStockphoto hide caption

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Prepare to see this more often, even in usually cooler climes, the experts say. Elaine Thompson/AP hide caption

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Richard Harris

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GED = gross external damages from pollution.

Environmental Accounting for Pollution hide caption

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Will Economic Growth Destroy The Planet?

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