WASHINGTON, Jan. 18 (TNSjou) -- The U.S. Department of Energy's Lawrence Berkeley National Laboratory issued the following news release: Tropical forests are crucial for sucking up carbon dioxide from the atmosphere. But they're also subject to intense storms that can cause "windthrow" - the uprooting or breaking of trees. These downed trees decompose, potentially turning a forest from a carbon sink into a carbon source. A new study finds that more extreme thunderstorms from climate change wil  more