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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FAIRFAX, VA - May, 24: One Direction member Louis Tomlinson performs at the Patriot Center in Fairfax, VA, on Thursday, May 24, 2012, as part of their Up All Night Tour. (Photo by Toni L. Sandys/The Washington Post)

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The British-Irish boy band One Direction performs at the Patriot Center in Fairfax as part of their Up All Night Tour.

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Fleet Week, solar impulse plane, artificial heart, Air Force academy graduation and more in the day in photos

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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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CANNES, FRANCE - MAY 24: Actress Macy Gray attend the 'The Paperboy' photocall during the 65th Annual Cannes Film Festival at Palais des Festivals on May 24, 2012 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images)

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Macy Gray, Zac Efron, Philip Phillips, Fantasia Barrino, Neil Diamond and other celebrities.

DANCING WITH THE STARS THE RESULTS SHOW - 'Episode 1410A' - After 10 weeks of highly entertaining performances and phenomenal dancing, Donald Driver and Peta Murgatroyd were crowned 'Dancing with the Stars' champions, on the two-hour Season Finale of 'Dancing with the Stars the Results Show' on TUESDAY, MAY 22 (9:00-11:00 p.m., ET), on ABC. (ABC/ADAM TAYLOR)

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Season 14 of “Dancing With the Stars.”

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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The National Zoo has two new additions: the female cheetah cub, left, and her brother on the right.

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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)

Joplin, Missouri, one year after tornadoes devastate town

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