Environment

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Solar panels that were recently placed on the roof of the building supplying energy to the AirTrain at Newark Liberty International Airport are seen as the train rolls by, Thursday, April 24, 2014, in Newark, N.J. According to The Port Authority of New York & New Jersey, the 3,200-solar panel installation spread among four building rooftops will supply the airport with 0.7 MW, equivalent to powering 61 homes with electricity, conserving 992 barrels of oil or removing 90 passenger vehicles from the road each year. (AP Photo/Julio Cortez)

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Solar panels that were recently placed on the roof of the building supplying energy to the AirTrain at Newark Liberty International Airport are seen as the train rolls by, Thursday, April 24, 2014, in Newark, N.J. According to The Port Authority of New York & New Jersey, the 3,200-solar panel installation spread among four building rooftops will supply the airport with 0.7 MW, equivalent to powering 61 homes with electricity, conserving 992 barrels of oil or removing 90 passenger vehicles from the road each year. (AP Photo/Julio Cortez)

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Katie Spring rolls up plastic that was used to cover certain plants during the winter in a field at the Good Heart Farmstead, Thursday, April 24, 2014, in Worcester, Vt. Spring and her husband Edge Fuentes, who both own the farm, back the GMO labeling bill passed by the Vermont Legislature. They believe people need to be able to know what’s in their food. (AP Photo/Wilson Ring)

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Peter Sorensen, left, a University of Minnesota professor of fisheries and aquatic biology, and doctoral student Dan Zielinski, right, sit in a 10,000- liter experiment tank on Wednesday, April 23, 2014, in their lab in St. Paul, Minn. in which they have created sound and bubble barriers to divert invasive Asian Carp. Sorensen, the director of the Aquatic Invasive Species Research Center, holds an underwater speaker. They hope to receive $60,000 in funding to order and install five 196-decibel speakers at the Lock & Dam #8 on the Mississippi River at Genoa, Wis. to stop the spread of bighead and silver carp, which are successfully breeding below the dam. (AP Photo/ Pioneer Press, Scott Takushi)

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This photo released by The Alaska Department of Transportation and Public Facilities (DOT&PF) shows the Alaska DOT&PF Alaska Marine Highway System floating dock submerged in Skagway, Alaska, on Thursday, April 24, 2014. The floating dock used by the state ferry system in Skagway sank overnight. The Alaska Marine Highway Service says in a Thursday release that the Skagway Ferry Terminal will be closed until further notice since the dock used by state ferries is inoperable. (AP Photo/Alaska Department of Transportation and Public Facilities)

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Skagway resident Wayne Selmer looks at The Alaska Department of Transportation and Public Facilities (DOT&PF) Alaska Marine Highway System floating dock submerged underwater in Skagway, Alaska, on Thursday, April 24, 2014. The floating dock used by the state ferry system in Skagway sank overnight. The Alaska Marine Highway Service says in a Thursday release that the Skagway Ferry Terminal will be closed until further notice since the dock used by state ferries is inoperable. (AP Photo/Katherine Emmets)

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FILE - In this April 2, 2014 file photo Calvin West, from Meyer Dairy Farm, watches spent grain bound for the farm fill a trailer at Empyrean Brewing in Lincoln, Neb. The federal government is backing off proposed regulations aimed at preventing livestock contamination that brewers say would add to their costs without improving the safety of grain used to feed livestock. Many beer makers sell or give grain leftover from the brewing process to farmers, who use it as feed for dairy cows and other animals. (AP Photo/The Journal-Star, Gwyneth Roberts, File)

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In this photo taken on April 11, 2014, and provided by the Wildlife Conservation Society, “Tutti,” a female Western Lowland gorilla holds her baby at the Bronx Zoo Congo Gorilla Forest in New York. With the addition of two new baby gorillas recently born at the zoo, the Bronx Zoo’s Congo Gorilla Forest is now home to 20 gorillas. (AP Photo/WCS, Julie Larsen Maher)

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In this photo taken on Tuesday, April 22, 2014, and provided by the Wildlife Conservation Society, “Tutti,” a female Western Lowland gorilla looks down at her sleeping baby at the Bronx Zoo in New York. With the addition of two new baby gorillas recently born at the zoo, the Bronx Zoo’s Congo Gorilla Forest is now home to 20 gorillas. (AP Photo/WCS, Julie Larsen Maher)

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In this photo taken on April 11, 2014, and provided by the Wildlife Conservation Society, a female Western Lowland gorilla clings to her baby at the Bronx Zoo in New York. With the addition of two new baby gorillas recently born at the zoo, the Bronx Zoo’s Congo Gorilla Forest is now home to 20 gorillas. (AP Photo/WCS, Julie Larsen Maher)