Environment

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FILE - In this June 25, 2012 file photo, a crew works on a gas drilling rig at a well site for shale based natural gas in Zelienople, Pa. The Obama administration is requiring companies that drill for oil and natural gas on federal lands to disclose chemicals used in hydraulic fracturing operations. A final rule released Friday also updates requirements for well construction and disposal of water and other fluids used in fracking, a drilling method that has prompted an ongoing boom in natural gas production. (AP Photo/Keith Srakocic, File)

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Freshman Melo Trimble, a native of Upper Marlboro, Maryland, has led the Maryland Terrapins to a 27-6 record and a No. 4 seed in the Midwest region of the NCAA tournament. (Associated Press)

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Former California Gov. Arnold Schwarzenegger's U.S. Forest Ranger jacket hangs on the podium before an Oct. 30, 2013 ceremony at the Agriculture Department in Washington where he was named the U.S. Forest Service's third honorary Forest Ranger for his leadership on climate change. (Associated Press)

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Donald Trump has launched a presidential exploration committee with all the trimmings — complete with a trip to New Hampshire. (NBC photo)

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The Obama administration has been skeptical of the proposed Asian Infrastructure Investment Bank from the start, arguing that it could prove redundant and could undercut lending standards on such issues as worker protections and the environment. (Associated Press)

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Britain’s Prince Charles departs after speaking at a meeting of companies, leading environmental organizations and government figures brought together to consider actions to address the threat posed by marine plastic waste, Wednesday, March 18, 2015, at the Hay Adams Hotel in Washington. (AP Photo/Andrew Harnik)