LONDON (Reuters) – The arctic tundra emits the same amount of methane in winter as in the warmer months, a surprising finding that bolsters understanding of how greenhouse gases interact with nature, researchers said on Wednesday. Scientists have long known that wetlands produce large amounts of methane and had thought it unlikely that greenhouse gases escaped from beneath frozen tundra, said Torben Christensen, a biogeochemist at Lund University in Sweden. "Mother Nature is showing us something that is really surprising," Christensen, who led the study published in the journal Nature, said in a telephone interview. "Nobody would expect to have...