Environment

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In this June 12, 2014 aerial photo, the Missouri River winds through the countryside near Williston, N.D. The epicenter of the oil boom is a 45-mile stretch of U.S. Route 85 in North Dakota between the towns of Williston and Watford City. (AP Photo/Charles Rex Arbogast)

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Sierra Club volunteer Alex Burke organizes signs to hand out near the local Environmental Protection Agency offices, on the first of two days of public hearings held by the EPA on President Barack Obama's plan to cut carbon dioxide emissions by 30 percent by 2030, in Denver, Tuesday, July 29, 2014. In hearings, hundreds of people across the country are telling the EPA its new rules for power-plant pollution either go too far or not far enough. (AP Photo/Brennan Linsley)

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In a July 24, 2014 photo, an Enbridge crude oil pipeline is exposed by erosion where it crosses the Tamarac River in northwestern Minnesota. Three of the seven lines that cross the river are exposed. Floodwater has eroded soil that once buried the pipelines several feet below ground. (AP Photo/MPR News, Dan Gunderson)

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Former Alaska governor and 2008 Republican vice presidential nominee Sarah Palin and actor/comedian Tina Fey.

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This is a 2013 photo of Everette Brown of the Philadelphia Eagles NFL football team. This image reflects the Philadelphia Eagles active roster as of Monday, April 15, 2013 when this image was taken. (AP Photo)

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In this May 22, 2014, photo, empty train cars, front, sit in a yard after having their loads of coal unloaded at Norfolk Southern's Lamberts Point coal terminal in Norfolk, Va. As the Obama administration weans the U.S. off dirty fuels blamed for global warming, energy companies have been sending more of America’s unwanted energy leftovers to other parts of the world. It’s a global shell game on fossil fuels that at the very least makes the U.S. appear to be making more progress on global warming than it actually is, because it shifts some of the pollution, and the burden for cleaning it up, onto another country’s balance sheet. (AP Photo/Patrick Semansky)

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National Edition News cover for July 28, 2014 - Energy Department eyes regional gas reserves for emergency use: New Jersey state troopers kept order as motorists and pedestrians waited in long lines to purchase gasoline in the paucity following Superstorm Sandy. The storm's fallout highlighted the need for increased domestic oil reserves. (associated press)