United Press International: Sunlight in the arctic is delivering a double climate blow, researchers say, by both melting ice and speeding up the release of greenhouse gases.
Dead vegetation preserved in far northern permafrost under ice is estimated to contain twice as much carbon dioxide as is held by the atmosphere, and global warming could allow this plant matter to decompose, releasing both that CO2 and methane, they say.
Rose Cory at the University of North Carolina at Chapel Hill and her colleagues, studying melting...