Environmental News Network: As temperatures rise, some of the organic carbon stored in Arctic permafrost meets an unexpected fateburial at sea. As many as 2.2 million metric tons of organic carbon per year are swept along by a single river system into Arctic Ocean sediment, according to a new study an international team of researchers published today in Nature. This process locks away carbon dioxide (CO2) - a greenhouse gas - and helps stabilize the earths CO2 levels over time, and it may help scientists better predict how...