Environment

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FILE - In this Dec. 5, 2012 file photo, a sewer cover is seen along the shore of Lake Champlain in Burlington, Vt. The state is attempting to improve water quality to non-wastewater runoff into Lake Champlain. A wide swath of Vermont environmentalists, from rural water treatment workers to statewide watershed protection groups, say they are looking at their budgets and making contingency plans to prepare for deep proposed federal cuts to programs they rely on. (AP Photo/Toby Talbot, File)

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In this photo taken Thursday, March 30, 2017, workers inspect downed power lines along a road, in Las Vegas. Workers are removing downed trees and restoring electricity in the Las Vegas area after a spring storm whipped winds to more than 70 mph (113 kph), overturning tractor-trailer trucks and dropping power lines onto cars near the Las Vegas Strip. (AP Photo/John Locher)

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Workers clear debris from a tree that fell on a structure, Friday, March 31, 2017, in Las Vegas. Workers are removing downed trees and restoring electricity in the Las Vegas area after a spring storm Thursday whipped winds to more than 70 mph (113 kph), overturning tractor-trailer trucks and dropping power lines onto cars near the Las Vegas Strip. (AP Photo/John Locher)

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A worker clears debris from a tree that fell on a structure, Friday, March 31, 2017, in Las Vegas. Workers are removing downed trees and restoring electricity in the Las Vegas area after a spring storm Thursday whipped winds to more than 70 mph (113 kph), overturning tractor-trailer trucks and dropping power lines onto cars near the Las Vegas Strip. (AP Photo/John Locher)

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In this photo provided by WPRO-AM, a confederate flag hangs at a Rhode Island Department of Transportation garage facility, visible during a news conference about work zone safety, Friday, March 31, 2017, in East Providence, R.I. The flag was removed before the news conference ended. (Steve Klamkin/WPRO-AM via AP)

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Traffic is bumper to bumper as people scrambled to find alternate routes on Friday, March 31, 2017. Many commuters in some of Atlanta's densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/Alex Sanz)

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A firefighter walks past a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Many commuters in some of Atlanta's densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/David Goldman)

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A firefighter works the scene where a section of an overpass collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Many commuters in some of Atlanta's densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/David Goldman)

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Construction workers and firefighters survey a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Many commuters in some of Atlanta's densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/David Goldman)

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Crews work on a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Many commuters in some of Atlanta's densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/David Goldman)

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Crews work on a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Many commuters in some of Atlanta's densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/David Goldman)

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FILE - In this Feb. 21, 2017, file photo, Bao Bao, the beloved 3-year-old panda at the National Zoo in Washington, enjoys a final morning in her bamboo-filled habitat before her one-way flight to China to join a panda breeding program. China is planning to create a preserve for the giant panda that will be three times the size of Yellowstone National Park in the western U.S. The Xinhua News Agency says the panda preserve will incorporate parts of three western provinces to provide an unbroken range for the endangered animals in which they can meet and mate in the interests of enriching their gene pool. (AP Photo/J. Scott Applewhite, File)

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Smoke billows from a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Thursday, March 30, 2017. Witnesses say troopers were telling cars to turn around on the bridge because they were concerned about its integrity. Minutes later, the bridge collapsed. (AP Photo/David Goldman)

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Firefighters survey the section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Thursday, March 30, 2017. Atlanta officials say a massive fire that burned for more than an hour caused the collapse of the interstate overpass. Georgia Gov. Nathan Deal has issued a state of emergency for the county. (AP Photo/David Goldman)

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Officials survey the section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Thursday, March 30, 2017. Atlanta officials say a massive fire that burned for more than an hour caused the collapse of the interstate overpass. Georgia Gov. Nathan Deal has issued a state of emergency for the county. (AP Photo/David Goldman)

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Firefighters survey the section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Thursday, March 30, 2017. Atlanta officials say a massive fire that burned for more than an hour caused the collapse of the interstate overpass. Georgia Gov. Nathan Deal has issued a state of emergency for the county. (AP Photo/David Goldman)

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Damage is seen to support columns as firefighters survey the section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Thursday, March 30, 2017. Atlanta officials say a massive fire that burned for more than an hour caused the collapse of the interstate overpass. Georgia Gov. Nathan Deal has issued a state of emergency for the county. (AP Photo/David Goldman)

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A firefighter surveys the section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Thursday, March 30, 2017. Atlanta officials say a massive fire that burned for more than an hour caused the collapse of the interstate overpass. Georgia Gov. Nathan Deal has issued a state of emergency for the county. (AP Photo/David Goldman)

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Firefighters survey the section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Thursday, March 30, 2017. Atlanta officials say a massive fire that burned for more than an hour caused the collapse of the interstate overpass. Georgia Gov. Nathan Deal has issued a state of emergency for the county. (AP Photo/David Goldman)

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In this Monday, Jan. 30, 2017 photo, lithium carbonate is ready for shipping in a Silver Peak lithium mine warehouse near Tonopah, Nev. Each sack contains 500 kilograms of lithium carbonate. (Steve Marcus /Las Vegas Sun via AP)