Jan. 24, 2012, Tromsoe, Norway. (AP Photo/Scanpix Norway, Rune Stoltz Bertinussen)

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September 2, 2007, Kangerlussuaq, Greenland (Uriel Sinai/Getty Images)

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March 17, 2013, Tallinn, Estonia (RAIGO PAJULA/AFP/Getty Images)

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Nov. 7, 2004, Robins, Iowa (AP Photo/The Gazette, David Wallace)

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Arctic sea, Norway (AP Photo/Royal Navy)

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March 17, 2013, Kenai, Alaska (AP Photo/M. Scott Moon)

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Feb. 13, 2011, Grotfjord, Norway (AP Photo/Keystone, Martial Trezzini) NO SALES, NO ARCHIVE

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Feb. 14, 2012, Kenai, Alaska (AP Photo/Peninsula Clarion, M. Scott Moon) MAGS OUT, NO SALES

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March 8, 2012, Yellowknife, North West Territories (AP Photo/The Canadian Press, Bill Braden)

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March 9, 2011, Takotna, Alaska (AP Photo/The Anchorage Daily News, Bob Hallinen, File)

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March 9, 2012, Ruby, Alaska (AP Photo/The Anchorage Daily News, Marc Lester)

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July 15, 2012, Lake Elora in northern Minnesota (AP Photo/The Star Tribune, Brian Peterson)

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March 17, 2013, Kenai, Alaska (AP Photo/M. Scott Moon)

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Oct. 12, 2012 West Anchorage, Alaska.(AP Photo/The Anchorage Daily News, Bob Hallinen)

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Jan. 23, 2012, Talkeetna, Alaska (AP Photo/Michael Dinneen, file)

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