Pipeline construction work north of Fort McMurray in the heart of the Canadian tar sands. The tar sands is the world's largest industrial project and the most environmentally destructive. The pipelines carry the raw bitumen refined from the tar sands. Most of the pipelines are operated by Enron. They have an unenviable reputation when it comes to safety. Their pipelines leak on average at least once a week. There are several proposed new pipeline routes to get the oil to market in the USA, but protests meet Enron, wherever they propose to lay a new pipeline.