Waves pound a sea wall in Pacifica, Calif., during a storm in 2010. Small assumptions can make a big difference when putting a price-tag on future disasters. Paul Sakuma/AP hide caption

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Episode 388: Putting A Price Tag On Your Descendants
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A new program led by the U.S. seeks to limit amounts of soot, hydrofluorocarbons and methane released into the atmosphere. In this file photo from 2009, a researcher ignites trapped methane from under a pond's ice cap in Alaska. Todd Paris/AP hide caption

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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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