Environment

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In this, Tuesday, Feb. 7, 2017 photo, Sarah Egner, director of curriculum development at Marinelab in Key Largo, Fla., examines a filter with material drained from a water sample under a microscope to check for the presence of microscopic plastics. Gulf Coast researchers are preparing to launch a two-year study to see what kinds of microscopic plastics can be found in the waters from south Texas to the Florida Keys. The project will expand a year's worth of data collected around the state of Florida that predominantly found microfibers, shreds of plastic even smaller than the microbeads targeted by a federal ban. (AP Photo/Wilfredo Lee)

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In this, Tuesday, Feb. 7, 2017 photo, Sarah Egner, director of curriculum development at Marinelab in Key Largo, Fla., takes a water sample to check for the presence of microscopic plastics in the water. Gulf Coast researchers are preparing to launch a two-year study to see what kinds of microscopic plastics can be found in the waters from south Texas to the Florida Keys. The project will expand a year's worth of data collected around the state of Florida that predominantly found microfibers, shreds of plastic even smaller than the microbeads targeted by a federal ban. (AP Photo/Wilfredo Lee)

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In this Thursday, March 2, 2017, photo, marine mammal biologist Christin Murphy, hands only, displays close-up images of seal whiskers generated by an electron microscope in a laboratory at the Naval Undersea Warfare Center, in Newport, R.I. Scientists think real seals, specifically their whiskers, may be the key to a new way for ships and underwater vehicles to sense their environment. (AP Photo/Steven Senne)

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In this Thursday, March 2, 2017 photo, engineer David Wade, top, and marine mammal biologist Christin Murphy, bottom, position a seal whisker inside a water tunnel in a laboratory at the Naval Undersea Warfare Center, in Newport, R.I. Scientists think real seals, specifically their whiskers, may be the key to a new way for ships and underwater vehicles to sense their environment. (AP Photo/Steven Senne)

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This March 14, 2017 photo shows damage to the sea wall on the Manasquan Inlet in Point Pleasant Beach, N.J. Pounding waves at a bend where the inlet becomes the Manasquan River bashed a 10-foot hole in the sea wall and destroyed a memorial park honoring fishermen who lost their lives at sea. (AP Photo/Wayne Parry)

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This March 14, 2017 photo shows damage to the sea wall on the Manasquan Inlet in Point Pleasant Beach, N.J. Pounding waves at a bend where the inlet becomes the Manasquan River bashed a 10-foot hole in the sea wall and destroyed a memorial park honoring fishermen who lost their lives at sea. (AP Photo/Wayne Parry)

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In this Monday, March 6, 2017, photo, a bull moose whose antlers recently dropped walks toward hikers near Connors Bog in Anchorage, Alaska. Confrontations between moose and Alaska residents are leading wildlife officials to warn people to give the animals some distance. The department says moose are nutritionally stressed and probably tired from the long Alaska winter. (AP Photo/Dan Joling)

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In this Monday, March 6, 2017, photo, a bull moose whose antlers recently dropped walks toward hikers near Connors Bog in Anchorage, Alaska. Confrontations between moose and Alaska residents are leading wildlife officials to warn people to give the animals some distance. The department says moose are nutritionally stressed and probably tired from the long Alaska winter. (AP Photo/Dan Joling)

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Pedestrians use the crosswalk at U Street in lighter than normal traffic in the District on Tuesday. A storm of snow and freezing rain covered most of the region. (Associated Press)

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Peng Shuai, of China, returns a shot to Venus Williams at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Venus Williams returns a shot to Peng Shuai, of China, at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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This Friday, March 3, 2017, photo provided by Tanya D. Flowers shows Flowers hugging her Maltese dog Paris after she was reunited with her dog at her apartment in Jersey City, N.J. An animal shelter in Staten Island, N.Y., called Flowers in early March 2017 to tell her Paris had been found after the dog disappeared in September 2016. (Tanya D. Flowers via AP)

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This photo supplied by the Environmental Protection Agency shows oil trapped by a berm and siphon dam in a dry ravine where the oil from a Chevron spill was stopped March 7, 2017, near Rangely, Colo. Chevron Corp. says its crews are cleaning up about 4,800 gallons of oil that spilled from a failed pipeline into an intermittent stream on public land in northwestern Colorado. State officials said Tuesday, March 14, 2017, that the oil travelled about 2 miles downstream along an unnamed tributary of Stinking Water Creek in Rio Blanco County. (Environmental Protection Agency via AP)

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The 165-year-old Buck Covered Bridge in Beltzville State Park will be restored. A grass-roots effort to preserve a more than 165-year-old covered bridge is underway in Carbon County. Friends of Beltzville State Park, a nonprofit group started two years ago to enhance the park outside Lehighton, took on the project to restore the bridge built by the Buck family in 1841, said John Dworsky, who is heading the project. (Ellen F. O'Connell/Hazleton Standard-Speaker via AP)

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The 165-year-old Buck Covered Bridge in Beltzville State Park will be restored. A grass-roots effort to preserve a more than 165-year-old covered bridge is underway in Carbon County. Friends of Beltzville State Park, a nonprofit group started two years ago to enhance the park outside Lehighton, took on the project to restore the bridge built by the Buck family in 1841, said John Dworsky, who is heading the project. (Ellen F. O'Connell/Hazleton Standard-Speaker via AP)

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Termite damage can be seen on a post of the 165-year-old Buck Covered Bridge State Park in Beltzville State Park. A grass-roots effort to preserve a more than 165-year-old covered bridge is underway in Carbon County. Friends of Beltzville State Park, a nonprofit group started two years ago to enhance the park outside Lehighton, took on the project to restore the bridge built by the Buck family in 1841, said John Dworsky, who is heading the project. (Ellen F. O'Connell/Hazleton Standard-Speaker via AP))

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FILE - In this April 18, 2013 aerial file photo, the remains of a nursing home, left, apartment complex, center, and fertilizer plant, right, destroyed by an explosion at a fertilizer plant in West, Texas. The Trump administration is delaying a new rule tightening safety requirements for companies that store large quantities of dangerous chemicals. Environmental Protection Agency (EPA) Administrator Scott Pruitt has delayed the effective date of the Obama-era rule until June. (AP Photo/Tony Gutierrez, File)

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FILE - In this Feb. 21, 2017 file photo, Environmental Protection Agency (EPA) Administrator Scott Pruitt speak in Washington. The Trump administration is delaying a new rule tightening safety requirements for companies that store large quantities of dangerous chemicals. Pruitt has delayed the effective date of the Obama-era rule until June. (AP Photo/Susan Walsh, File)

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FILE - This April 9, 2015, file photo shows the south portal of the proposed Yucca Mountain nuclear waste dump near Mercury, Nev. Nevada lawmakers are being asked to commit about $3.75 million over the next two years to fund the fight against a federal proposal to bury the nation's most radioactive waste at Yucca Mountain, about 100 miles northwest of Las Vegas. (AP Photo/John Locher, File)