Can oil from tar sands be cleaned up?
点击量： 时间：2019-03-08 13:02:01
By Bob Holmes in Fort McMurray, Alberta IN THE Canadian province of Alberta the ground is skinned and gutted. Rising oil prices and dwindling reserves have pushed oil companies to exploit what was once considered unexploitable: tar sands, the dirtiest oil on Earth and the most expensive to extract. This strip-mined landscape is bad enough, but another method of extracting the oil is on the rise,