What could be worse than a ruptured pipeline of crude oil? A ruptured pipeline of tar sands oil 鈥� a thick, sticky substance. Cleanup of a 2010 spill in Michigan's Kalamazoo River took much longer and was far harder than anyone had anticipated. It's now a cautionary tale for people in the middle of the new Keystone pipeline's path.

New EPA rules would control air pollution coming from wells being drilled by the oil and natural gas industries. The rules are a result of a lawsuit by an environmental group that sued the agency to clean up the drilling industry after communities in Colorado, New Mexico and Wyoming complained about air pollution.