BP%27s Deepwater Horizon drilling platform disaster which started on April 10%2C 2010 and leaked 3.19 million barrels of oil into the Gulf of Mexico across 87 days%2C causing %2462 billion in damages and clean-up costs. It is by far the worst oil spill in U.S. history. NEPA is a law intended to protect the public interest against such disasters. Photo courtesy NOAA