Climate News Network: The Mackenzie River Basin, a vast globally important area in Canada, is at great risk from climate change and a catastrophic oil spill from the tailing ponds of tar sands mining, according to a panel of nine Canadian, American and British scientists. The warning came just days after the Canadian Oil Producers Association says it expects oil production from tar sands in the region to double by 2030. The Mackenzie River Basin showing how it drains north to the Arctic Ocean. A report produced after...