Environment

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North Carolina's Allisha Gray (15) and Stephanie Mavunga guard Duke's Elizabeth Williams (1) during the second half of an NCAA college basketball game in Durham, N.C., Monday, Feb. 10, 2014. North Carolina won 89-78. (AP Photo/Gerry Broome)

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Then-Heritage Foundation President Jim DeMint, a former South Carolina senator, addresses a forum at the organization in 2014. (ASSOCIATED PRESS)

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Emergency crews from several towns work an area outside the New Hampshire Ball Bearing plant after an explosion, Monday, Feb. 10, 2014 in Peterborough, N.H. At least 13 people were injured, but a company spokeswoman says none of the injuries appears to be life-threatening. (AP Photo/Jim Cole)

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Emergency crews from several towns work an area outside the New Hampshire Ball Bearing plant after an explosion, Monday, Feb. 10, 2014 in Peterborough, N.H. At least 13 people were injured, but a company spokeswoman says none of the injuries appears to be life-threatening. (AP Photo/Jim Cole)

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Emergency crews from several towns work an area outside the New Hampshire Ball Bearing plant after an explosion, Monday, Feb. 10, 2014 in Peterborough, N.H. At least 13 people were injured, but a company spokeswoman says none of the injuries appears to be life-threatening. (AP Photo/Jim Cole)

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Firefighters battle a rubber fire at Ocean Terminal Warehouse No.3 at the Georgia Ports Authority in Savannah, Ga., on Saturday, Feb. 8, 2014. Burning rubber from the fire at the Port of Savannah sent up a towering column of black smoke that could be seen from miles away. The cause of the fire wasn't immediately known, but all port workers were accounted for and unharmed.(AP Photo/Savannah Morning News, Richard Burkhart)

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FOR RELEASE SATURDAY, Feb. 15, 2014, AT 12:01 A.M. CST AND THEREAFTER - In this Jan. 29, 2014 photo, Jim Leonard watches as his ice cleaning machine gets used to clean the ice at the Lion's Park ice rinks in Lake Elmo, Minn. (AP Photo/The St. Paul Pioneer Press, Jean Pieri)