Grist: Thousands of barrels of tar-sands oil have been burbling up into forest areas for at least six weeks in Cold Lake, Alberta, and it seems that nobody knows how to staunch the flow.
An underground oil blowout at a big tar-sands operation run by Canadian Natural Resources Ltd. has caused spills at four different sites over the past few months. (This is different from the 100-acre spill in Alberta that we told you about last month, which was caused by a ruptured pipeline.)
Media and others have...