XL Keystone Dirty Tar Sands

Tar sands are an extremely dirty form of energy, so much in fact, that they were once regarded by the oil industry as too dirty to effectively refine. For every barrel of oil extracted, three to five barrels of water are forever contaminated.
http://action.foodandwaterwatch.org/p/salsa/web/common/public/content?content_item_KEY=9557