Environment

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This aerial photo shows a view of homes on the North side of the fertilizer plant explosion site on April 18, 2013, in Near West, Texas. A massive explosion at the West Fertilizer Co. killed as many as 15 people and injured more than 160, officials said. (Associated Press)

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South Korean Army soldiers patrol on Unification Bridge in Paju, South Korea, near the border village of Panmunjom, on April 16, 2013. North Korea's state media said the Supreme Command of the Korean People's Army issued an ultimatum demanding an apology from South Korea for "hostile acts" and threatening that unspecified retaliatory actions would happen at any time. (Associated Press)

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People evacuate buildings as an earthquake was felt in Karachi, Pakistan, Tuesday, April 16, 2013. (AP Photo/Shakil Adil)

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The wreckage of a U.S. Marine helicopter CH-53E Super Stallion helicopter smolders after it made a "hard landing" during an exercise called SsangYong, a Korean Marine Exchange Program and part of the Foal Eagle exercise in Chulwon, north of Seoul, South Korea, Tuesday, April 16, 2013. Twenty-one personnel were on board the helicopter, including five crew members, according to a statement from United States Forces Korea. All were taken to the hospital, but 15 were quickly released. The remaining six were in stable condition. (AP Photo/Yonhap) KOREA OUT

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This image from the U.S. Department of Agriculture shows a giant African snail with an albino shell. (Courtesy of the USDA)

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** FILE ** This Dec. 4, 2012, photo provided by The Goldman Environmental Prize shows Kimberly Wasserman Nieto, of Chicago, standing outside Midwest Generation's Crawford Generating Station in Chicago. (AP Photo/Courtesy of The Goldman Environmental Prize, Jennifer Walton)

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Visitors use binoculars to scan North Korean territory from the vantage point of the unification observation post near the border village of Panmunjom separating North and South Korea. (Associated Press)

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Cherry blossoms begin to open on the branches of the famous Yoshino cherry trees along the Tidal Basin, Sunday, April 7, 2013, in Washington. Peak blossom time has been postponed by chilly weather. (AP Photo/Carolyn Kaster)

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The Port of Corpus Christi plays a vital role in shipping Eagle Ford oil, and U.S. and foreign manufacturers plan to open plants there to make steel and plastic products as well as pipes to transport the fuel. (Corpus Christi Caller-Times photographs)

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** FILE ** A Honda Civic Hybrid in Saco, Maine, 2002. More than 1 million vehicles in North America are part of a worldwide recall for an airbag problem affecting three big automakers. Toyota, Honda and Nissan are recalling more than 2 million vehicles because the inflator on the passenger side may burst, sending plastic pieces flying. (AP Photo/Robert F. Bukaty, File)

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Visitors take pictures and watch the sunrise around the cherry blossoms at the Tidal Basin, in Washington, DC., Thursday, April 11, 2013. (Andrew S Geraci/The Washington Times)