Fracking ("Meet the Frackers," by Tyler Edgar, March 2011) is well-known to people in Colorado, Wyoming, Pennsylvania, Texas, and other states for its disastrous use in natural gas extraction. However, even Edgar seems unaware of the use of fracking in oil extraction. The best -- or worst -- kept secret of North Dakota is that this dangerous process is now the primary means of oil extraction from the Bakken formation, with devastating effects on people, animals, and land.
Karen Van Fossan
Bismarck, North Dakota