Environment

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This March 30, 2014, photo shows University of Florida researchers working with invertebrate species caught in the Gulf Stream off the coast of Florida and headed for a unique shipboard laboratory where the scientists are studying the animals' genetics in real time. (AP Photo/Suzette Laboy)

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Sigrid Kaag of the Organization for the Prohibition of Chemical Weapons speaks during a press conference in Damascus, Syria on Sunday, April 27, 2014. Kaag told reporters in Damascus that 92.5 percent of Syria's chemical materials had been removed from the country and destroyed. She described it as “significant progress,” though she says the government needs to ensure the remaining materials are eradicated by the end of the month. (AP/Photo)

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A commercial building burns near downtown Memphis, Tenn., on Saturday, April 26, 2014. Officials say four Memphis firefighters were rescued from the burning building after a wall collapsed on them. (AP Photo/Mark Humphrey)

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Deandre Wright takes a picture of himself as he watches a nearby commercial building burn near downtown Memphis, Tenn., on Saturday, April 26, 2014. Officials say four Memphis firefighters were rescued from the burning building after a wall collapsed on them. (AP Photo/Mark Humphrey)

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People survey the damage Saturday, April 26, 2014, after a tornado touched down along Black Jack-Simpson Road in Greenville, N.C. on Friday, April 25, 2014. (AP Photo/The Daily Reflector, Aileen Devlin)