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TORNADO_1091
An emergency worker searches a Walmart store that was severely damaged by a tornado in Joplin, Mo., on Sunday, May 22, 2011. (AP Photo/Charlie Riedel)
TORNADO_1089
Don Atteberry, 89, surveys damage at his home in Joplin, Mo., on Monday, May 23, 2011, after it was severely damaged by a tornado on Sunday. The twister killed at least 89 people. (AP Photo/Charlie Riedel)
TORNADO_1088
On Monday, May 23, 2011, Anita Stokes salvages items from her Joplin, Mo., home, which was destroyed Sunday by a tornado. The large twister moved through much of the city, damaging a hospital and hundreds of homes and businesses and killing at least 89 people. (AP Photo/Charlie Riedel)
TORNADO_1087
A rescue worker walks past debris at Joplin High School in Joplin, Mo., on Monday, May 23, 2011. A large tornado moved through much of the city Sunday, severely damaging the school, a hospital, and hundreds of homes and businesses. The twister killed at least 89 people. (AP Photo/Charlie Riedel)
TORNADO_1085
A body is seen in a tornado-ravaged car while emergency workers wait for a medical team to arrive in Joplin, Mo., on Monday, May 23, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel)
TORNADO_1084
Emergency workers wait for a medical team after finding a body in a tornado-ravaged car in Joplin, Mo., on Monday, May 23, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel)
TORNADO_1083
** FILE ** An emergency worker searches a tornado-damaged Walmart store in Joplin, Mo., on Monday, May 23, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel)
TORNADO_1082
On Monday, May 23, 2011, an emergency worker searches a Walmart store that was severely damaged by a tornado in Joplin, Mo., on Sunday. (AP Photo/Charlie Riedel)
TORNADO_1081
Emergency workers wait for a medical team after finding a body in a tornado-ravaged car in Joplin, Mo., on Monday, May 23, 2011. A large tornado moved through much of the city Sunday, damaging hundreds of homes and businesses. (AP Photo/Charlie Riedel)
TORNADO_1079
A destroyed helicopter lies on its side in the parking lot of the Joplin Regional Medical Center in Joplin, Mo., on Sunday, May 22, 2011. A large tornado moved through much of the city, damaging the hospital and hundreds of homes and businesses. (AP Photo/Mark Schiefelbein)
TORNADO_1077
The damaged St. John's Regional Medical Center is seen in the distance through tornado debris in Joplin, Mo., on Monday, May 23, 2011. A large tornado moved through much of the city Sunday, damaging the hospital and hundreds of homes and businesses and killing at least 89 people. (AP Photo/Charlie Riedel)
TORNADO_1075
A shelf cloud containing a thunderstorm approaches a tornado-ravaged neighborhood of Joplin, Mo., on Monday, May 23, 2011. A large tornado moved through much of the city Sunday, damaging a hospital, hundreds of homes and businesses and killing at least 89 people. (AP Photo/Charlie Riedel)
TORNADO_1073
A man carries a young girl who was rescued after being trapped with her mother in their home after a tornado hit Joplin, Mo., on Sunday evening, May 22, 2011. The tornado tore a path a mile wide and four miles long, destroying homes and businesses. (AP Photo/Mike Gullett)
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Smoke rises from Iceland's Grimsvotn, the island nation's most active volcano, on Saturday, May 21, 2011. (AP Photo/Halldora Kristin Unnarsdottir)
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** FILE ** Local residents stand outside a shop with graffiti reading "leader of Muslims Mullah Mohammad Omar," on Sunday, May 8, 2011, in Pashin, 100 kilometers south of Quetta, Pakistan. (AP Photo/Arshad Butt)
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Technicians monitor the status of a fracking drill as it descends thousands of feet below the earth's surface. Opponents say fracking contaminates the water supply with chemicals used in the process. (Andrew S. Geraci/The Washington Times)
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"Hydraulic fracturing," or "fracking," requires backbreaking work, long hours and weeks at a time away from home. (Andrew S. Geraci/The Washington Times)
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A cleaned fracking pipe is ready for use in a drill operation. In 2007, drillers had 27 wells tapping the Marcellus Shale rock deposit in the state. Last year, a record 1,445 natural gas wells were drilled. (Andrew S. Geraci/The Washington Times)
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** FILE ** Dirt is moved over a water pipeline that will be used at a natural gas drilling site in Washington, Pa. Proponents of extracting natural gas from shale tout fracking as the key to satisfying the nation's booming energy appetite. (Andrew S. Geraci/The Washington Times)
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ASSOCIATED PRESS A pay raise for Interior Secretary Kennth L. Salazar is being held up by Sen. David Vitter, Louisiana Republican, who is pressing for more energy exploration in the Gulf of Mexico and says Interior's policies are hurting energy workers.
