"The Yukon River is delivering upwards of five tons of mercury a year to the Arctic environment, likely in response to a warming climate, scientists from the U.S. Geological Survey announced Tuesday."

"The river is pumping three to 32 times more mercury into the environment than similarly sized river basins, based on limited data. And while scientists don't know the reason for the Yukon's big mercury load, they say evidence points strongly to two suspects: Melting permafrost, and the Yukon basin's unique placement as a catchment for pollution from Asia and Europe."

Douglas Fischer reports for The Daily Climate October 25, 2011. [2]