PhysOrg: Frozen sediments (permafrost) in Eastern Siberia. Photo by: Sergei Zimov Click here to enlarge image New research indicates that the amount of frozen organic carbon locked away in the world’s permafrost regions – a major potential source of atmospheric carbon dioxide (CO2) and methane (CH4) – is double what has been previously estimated. In a paper published in the latest edition of Bioscience, an international team of scientists says whereas some of the CO2 produced as a result of …