Environment

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** FILE ** In this Sept. 9, 1999, file photo, fire and smoke rise from a destroyed apartment building in Moscow during an attack blamed on Chechen militants, as Russian Emergency Situations Ministry officers and firefighters try to save people. (AP Photo/Tatiana Makeyeva, file)

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Officials address the media during a news conference in Watertown, Mass., Friday, April 19, 2013. Officials are urging residents of Watertown and surrounding towns to stay indoors. (AP Photo/Julio Cortez)

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"Anybody with a boat can arrive. The melting of the ice in Alaska has created an enormous open border question."

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Photos of one of two suspects sought in the Boston Marathon bombing is displayed during a news conference talking about the investigation of the Boston Marathon explosions on April 18, 2013, in Boston. (Associated Press)

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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)