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FILE - In this Feb. 2, 2014 photo, people visit the caves at Apostle Islands National Lakeshore in northern Wisconsin, transformed into a dazzling display of ice sculptures by the arctic siege that gripped the Upper Midwest. The popular ice caves on Lake Superior will soon be closed due to ice melt, according to the Apostle Islands National Lakeshore Superintendent. The caves are usually accessible only by water, but Lake Superior’s rock-solid ice cover is letting people walk to them for the first time since 2009. (AP Photo/Minneapolis Star Tribune, Brian Peterson)

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Philanthropist Howard G. Buffett, the elder son of billionaire investor Warren Buffett, is to meet Friday with South Africa officials and conservationists to discuss the slaughter of rhinos. He will deliver a $23.7 million check to aid the conservation effort. (Laura Melo)

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This NOAA satellite image taken Wednesday, March 12, 2014 at 10:45 AM EST shows a late winter storm spreading clouds across most regions east of the Mississippi River with significant snow from the Ohio Valley and eastern Great Lakes into the Northern Appalachians and Northeast US and rain scross the Mid-Atlantic and Southeast US. (AP PHOTO/WEATHER UNDERGROUND)

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In this photo taken on Tuesday March 11, 2014, water flows through Sand Lake Coulee Creek in the town of Onalaska, Wis., after crews used dynamite to help clear up to five feet of ice. After the blast, crews dug out the ice and created a channel for the water. (AP Photo/The La Crosse Tribune, Chris Hubbach)

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In this photo taken on Tuesday March 11, 2014, water flows through Sand Lake Coulee Creek in the town of Onalaska, Wis., after crews used dynamite to help clear up to five feet of ice. After the blast, crews dug out the ice and created a channel for the water. (AP Photo/The La Crosse Tribune, Chris Hubbach)

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Firefighters continue to work a day after a structure fire in the Mission Bay neighborhood on Wednesday, March 12, 2014, in San Francisco. Hundreds of Mission Bay apartment dwellers chased from their homes by a huge fire at a building under construction are fortunate to have homes to return to, San Francisco Mayor Ed Lee said Wednesday, as firefighters put out hot spots and sought to determine the cause of the blaze. AP Photo/Marcio Jose Sanchez)

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Firefighters continue to work a day after a structure fire in the Mission Bay neighborhood on Wednesday, March 12, 2014, in San Francisco. Hundreds of Mission Bay apartment dwellers chased from their homes by a huge fire at a building under construction are fortunate to have homes to return to, San Francisco Mayor Ed Lee said Wednesday, as firefighters put out hot spots and sought to determine the cause of the blaze. AP Photo/Marcio Jose Sanchez)

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Firefighters continue to work a day after a structure fire in the Mission Bay neighborhood on Wednesday, March 12, 2014, in San Francisco. Hundreds of Mission Bay apartment dwellers chased from their homes by a huge fire at a building under construction are fortunate to have homes to return to, San Francisco Mayor Ed Lee said Wednesday, as firefighters put out hot spots and sought to determine the cause of the blaze. AP Photo/Marcio Jose Sanchez)

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FILE - In this Oct. 5, 2000 file photo, Ohio Valley Coal Mine employees and safety inspectors enter the Powhatan No. 6 coal mine near Alledonia, Ohio. Eighteen coal facilities in Ohio, including Powhatam No. 6, are operating with expired pollution-discharge permits under an agency where allegations of coal-industry influence arose during a personnel flap last year, an Associated Press review has found. (AP Photo/Jay LaPrete, File)

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Chicago Bears defensive end Lamarr Houston talks about his Batman earrings after an NFL football news conference where he was introduced as the newest member of the team Wednesday, March 12, 2014, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

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Chicago Bears defensive end Lamarr Houston smiles after being introduced as the newest member of the team during a news conference Wednesday, March 12, 2014, in Lake Forest, ill. (AP Photo/Charles Rex Arbogast)

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Chicago Bears safety Ryan Mundy smiles after being introduced as the newest member of the team during a news conference Wednesday, March 12, 2014, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

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Chicago Bears' general manager Phil Emery talks about free agents, defensive end Lamarr Houston and safety Ryan Mundy, after they were signed during an NFL football news conference Wednesday, March 12, 2014, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

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Vietnamese Air Force Col. Pham Minh Tuan uses binoculars on board a flying aircraft during a mission to search for the missing Malaysia Airlines flight MH370 in the Gulf of Thailand over the location where Chinese satellite images showed possible debris from the missing Malaysian jetliner, Thursday, March 13, 2014. (AP Photo)

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Vietnamese Air Force Col. Pham Minh Tuan watches out from a window on board a flying aircraft during a mission to search for the missing Malaysia Airlines flight MH370 in the Gulf of Thailand over the location where Chinese satellite images showed possible debris from the missing Malaysian jetliner, Thursday, March 13, 2014. (AP Photo)

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A pilot of a Royal Malaysian Air Force CN-235 aircraft shows a map during a search and rescue operation for the missing Malaysia Airlines plane over the waters at Malacca straits, Malaysia, Thursday, March 13, 2014. Planes sent Thursday to check the spot where Chinese satellite images showed possible debris from the missing Malaysian jetliner found nothing, Malaysia's civil aviation chief said, deflating the latest lead in the six-day hunt. The hunt for the missing Malaysia Airlines flight 370 has been punctuated by false leads since it disappeared with 239 people aboard about an hour after leaving Kuala Lumpur for Beijing early Saturday. (AP Photo/Lai Seng Sin)

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FILE - In this June 18, 2007 file photo, Roger Johnson, then the North Dakota agriculture commissioner , is seen in Bismarck, N.D. On Monday, March 10, 2014, Johnson was re-elected president of the National Farmers Union, a group he has led the group since 2009, after heading North Dakota's Agriculture Department for a dozen years. (AP Photo/Bismarck Tribune, Tom Stromme, File)

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Germany's Maria Hoefl Riesch is lifted to a rescue helicopter after crashing during a women's alpine skiing downhill at the World Cup finals in Lenzerheide, Switzerland, Wednesday, March 12, 2013. (AP Photo/Marco Trovati)