Aerial views of coal mining operations in Wyoming

Coal production’s center of gravity in the United States has moved from central Appalachia to the Powder River Basin in Wyoming and Montana.

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Aerial view of the Black Thunder coal mine operation in Wyoming. The coal mine opened in 1977.

/ EcoFlight

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WASHINGTON, DC - MAY 21: Members of the Naval Academy freshman class (plebes) lock arms and form a human ladder while climbing the Herndon Monument at the United States Naval Academy on May 21, 2012 in Annapolis, Md. Each year members of the Naval Academy's freshman class (plebes) climb the lard covered 21-foot tall Herndon Monument to replace a plebe dixie cup hat with a midshipman's hat that was placed at the top of the obelisk. (Photo by Ricky Carioti/The Washington Post)

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Red Panda Bears sleep in the Panda Bear enclosure at the Beijing Zoo on May 22, 2012. The zoo grounds were originally a Ming Dynasty imperial palace and finally opened to the public in 1908. The zoo's history states that during the WWII, most of the zoo's animals died of starvation with only 13 monkeys and one old emu surviving the war. AFP PHOTO/Mark RALSTONMARK RALSTON/AFP/GettyImages

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May 21, 2012: Members of the Naval Academy freshman class (plebes) lock arms and form a human ladder while climbing the Herndon Monument at the United States Naval Academy on May 21, 2012 in Annapolis, Md. Each year members of the Naval Academy's freshman class (plebes) climb the lard covered 21-foot tall Herndon Monument to replace a plebe dixie cup hat with a midshipman's hat at the top of the obelisk.

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US actress Cameron Diaz arrives for the European premiere of the film 'What To Expect When You're Expecting' at the IMAX Cinema in Waterloo in London, on May 22, 2012. AFP PHOTO/ANDREW COWIEAndrew Cowie/AFP/GettyImages

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JOPLIN, MO - MAY 19: Grace Goebel plays outside of the new Habitat for Humanity home of her parents that was built on the spot of a home that had been destroyed after a tornado hit the neighborhood almost one year ago on May 19, 2012 in Joplin, Missouri. Tuesday will mark the one-year anniversary of the EF-5 tornado that devastated the town. The tornado left behind a path of destruction along with 161 deaths and hundreds of injuries, but one year later there are signs that the town is beginning to recover. (Photo by Joe Raedle/Getty Images)

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COLLEGE PARK, MD - APRIL 4: Pet acupuncturist Greta McVey puts needles in mixed breed 'Cashew' at her home office in College Park, MD on April 4, 2012. Cashew was rescued by his owner this past December and suffers from anxiety and fear of abandonment. McVey first licensed as an acupuncturist on humans then went on to be certified on animals. She hosts a variety of clientele, anything from birds, to guinea pigs but mainly treats dogs and cats. (Photo by Linda Davidson/The Washington Post)

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