Environment

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In this photo taken on Feb. 13, 2014, John Wanecke, secretary/treasurer of the North Dakota Renewable Energy Society, poses for a photo in Bismarck, N.D, The non-profit group is launching "Solarize Burleigh County", community-wide purchase campaign to install solar panel on home and businesses. (AP Photo/The Bismarck Tribune, Mike McCleary)

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In this Tuesday, March 4, 2014 photo, Dave Ripplinger, a North Dakota State University agriculture economics professor, is seen his office in Fargo, N.D. Ripplinger has been talking with farmers in the last month about growing industrial beets for a proposed ethanol plant. (AP Photo/Dave Kolpack)

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In this Feb. 1, 2011 photo, Harborside Health Center employee Gerard Barber stands behind medical marijuana clone plants at Harborside Health Center in Oakland, Calif. Law and order may soon be coming to the Wild West of Weed. A California lawmaker has introduced legislation to regulate the state’s free-wheeling medical marijuana industry, the farmers that grow the drug, the hundreds of storefront shops that sell it and especially the doctors who write recommendations allowing people to use it. (AP Photo/Jeff Chiu)

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ADVANCE FOR USE SUNDAY MARCH 9, 2014, AND THEREAFTER- In this Aug. 19, 2012 photo, chestnuts grow on Chinese-American Dunstan hybrid chestnut tree in a grove at Pettijohn's Plant Farm in Raphine, Va. The farm grows chestnuts commercially. (AP Photo/The Daily News Leader, Mike Tripp) NO SALES

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Smoke from a wood stove wafts into the night sky, Saturday, March 8, 2014 in Freeport, Maine. Proposed regulations from the U.S. Environmental Protection Agency would significantly reduce the amount of particle pollution allowed from the smokestacks of new residential wood-powered heaters. (AP Photo/Robert F. Bukaty)

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A wood stove heats a home Saturday, March 8, 2014 in Freeport, Maine. Officials in Maine worry that the U.S. Environmental Protection Agency's proposed new rules governing wood stoves will be too costly for people in the poorest state in New England. (AP Photo/Robert F. Bukaty)

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Birding enthusiast Ron Payne of Middlebury, Vt., uses a scope to watch ducks on Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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Ducks take flight as the Essex-Charlotte ferry nears its dock on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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A juvenille bald eagle flies over the shoreline of Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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Ducks swim along an open ferry channel on Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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Birding enthusiast Ian Worley of Cornwall, Vt., uses a scope to watch ducks on Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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A Common Goldeneye duck flies over an open ferry channel on Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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A Greater Scaup duck flies over an open ferry channel on Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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Ducks fly over an open ferry channel on Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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A juvenile bald eagle flies over the frozen shoreline of Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)

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Ducks take flight from a ferry channel on Lake Champlain on Wednesday, March 5, 2014, in Essex, N.Y. Lake Champlain is frozen solid, except for two stretches of open water where two ferries carry passengers between Vermont and New York. The only open water within miles is attracting thousands of ducks and bald eagles looking to eat the ducks. It is had the side benefit of attracting birders from far away looking to spot rare duck species. (AP Photo/Mike Groll)