Permafrost carbon could up global warming

United Press International: Global warming may accelerate as billions of tons of carbon trapped in permafrost moves into the atmosphere by the end of this century, U.S. researchers say. Warming with climate change could cause soil in high-latitude regions to change from being a carbon sink, storing carbon dioxide, to a source of atmospheric CO2 by the end of the 21st century, computer modeling conducted by the U.S. Department of Energy's Lawrence Berkeley National Laboratory indicates. The finding contradicts earlier......

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