Huffington Post: Four recent oil spills at a major oil sands extraction site in Canada's Alberta province are still leaking oil into the ground, and officials aren't sure what caused them.
Bob Curran, a spokesman for the Alberta Energy Regulator, which is charged with regulating the oil industry in Alberta, told The Huffington that exact details surrounding the May and June spills that occurred at the Primrose extraction site operated by Canadian Natural Resources Ltd. are still unknown.
Further complicating...