Environment

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Debris is reflected in the glasses of Rickey Shelton as he salvages items from his home on Tuesday, April 29, 2014, after it was destroyed in Fayetteville, Tenn. Both Rickey and his wife, Silver, were home and survived by taking cover in a hallway. Around 50 tornadoes ravaged the South Monday, according to the National Oceanic and Atmospheric Administration's Storm Prediction Center. (AP Photo/Mark Humphrey)

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People work on clearing a tree off a shed after a storm in Smiths Station, Ala., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over two days flattened homes and businesses, and killed dozens from the Midwest to the Deep South. (AP Photo/Opelika-Auburn News, Albert Cesare)

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Rosie Hollingshead, 15, carries her father's collection of eagle figurines from her tornado-damaged home in Mayflower, Ark., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning.(AP Photo/Danny Johnston)

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An Arkansas Razorback flag hangs in front of a home destroyed by Sunday's tornado, Tuesday, April 29, 2014, in Vilonia, Ark. A dangerous storm system that spawned a chain of deadly tornadoes over two days flattened homes and businesses, and killed dozens from the Midwest to the Deep South. (AP Photo/Eric Gay)

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This Tuesday, April 29, 2014 photo shows the roof from a child's bedroom in the home of Mike Skinner, of Decatur, Miss., that was blown away from a tornado. Several homes were damaged and the Country Club across the street had significant damage to 140 golf sheds and trees downed on the golf course. (AP Photo/The Meridian Star, Paula Merritt)

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Caleb Emerson and his dog "Luke" rest in front of his Seventh Ave. home in Athens, Ala., Tuesday, April 29, 2014. A tornado took down the tree he is seated on. (AP Photo/The Decatur Daily, John Godbey)

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Washington Nationals starting pitcher Gio Gonzalez throws to a Houston Astros batter during the first inning of a baseball game Tuesday, April 29, 2014, in Houston. (AP Photo/David J. Phillip)

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National Edition News cover for April 30, 2014 - Reported threats put halt to internal inquiry at EPA: U.S. Environmental Protection Agency Administrator Gina McCarthy gestures as she speaks during the Tsinghua Environmental Forum at the Tsinghua University School of Environment in Beijing, China Tuesday, Dec. 10, 2013. (AP Photo/Andy Wong, Pool)