Environment

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California Gov. Jerry Brown gestures to a chart that show his proposal to spend $437 million on flood control and emergency response in the wake of recent storms, during a news conference Friday, Feb. 24, 2017, in Sacramento, Calif. (AP Photo/Rich Pedroncelli)

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This image made available on Feb. 15, 2017 by NASA shows an artist's concept of the launch of the Space Launch System rocket and Orion capsule. On Friday, Feb. 24, 2017, NASA said it is weighing the risk of adding astronauts to the first flight of its new megarocket. (NASA/Marshall Space Flight Center via AP)

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This image released by the Thiqa News Agency, burned motorcycles and car that damaged after a suicide attacker blew his small pick-up truck outside a security office in Sousian village, about 8 kilometers (5 miles) north of al-Bab, Syria, Friday, Feb. 24, 2017. A car bombing north of a Syrian town just captured by Turkish forces and Syrian opposition fighters from the Islamic State group killed several people, mostly civilians who had gathered trying to go back home, Turkey's news agency and Syrian activists said. (Thiqa News Agency, via AP) **FILE**

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This image released by the Thiqa News Agency, burned motorcycles that damaged after a suicide attacker blew his small pick-up truck outside a security office in Sousian village, about 8 kilometers (5 miles) north of al-Bab, Friday, Feb. 24, 2017. A car bombing north of a Syrian town just captured by Turkish forces and Syrian opposition fighters from the Islamic State group killed several people, mostly civilians who had gathered trying to go back home, Turkey's news agency and Syrian activists said. (Thiqa News Agency, via AP)

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This image released by the Thiqa News Agency, damaged cars after a suicide attacker blew his small pick-up truck outside a security office in Sousian village, about 8 kilometers (5 miles) north of al-Bab, Friday, Feb. 24, 2017. A car bombing north of a Syrian town just captured by Turkish forces and Syrian opposition fighters from the Islamic State group killed several people, mostly civilians who had gathered trying to go back home, Turkey's news agency and Syrian activists said. (Thiqa News Agency, via AP)

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In this Monday, Feb. 13, 2017 photo, Tessa Sarver works in the farm greenhouse preparing crops for the spring growing season and summer harvest at Sarver Hill Farms in Greensburg, Pa. (Christian Tyler Randolph /Pittsburgh Tribune-Review via AP)

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FILE - In this Wednesday, Nov. 16, 2016 file picture, journalists walk at the damaged ancient site of Nimrud, which was destroyed by the Islamic State militants, some 19 miles (30 kilometers) southeast of Mosul, Iraq. At a two-day UNESCO conference, Iraqi officials are asking for money and expertise to reclaim the cultural heritage that is on the verge of complete destruction by the Islamic State group. (AP Photo/Hussein Malla, File)

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FILE - In this July 27, 2005 file photo, the face of a woman stares down at visitors in the Hatra ruins, 320 kilometers (200 miles) north of Baghdad, Iraq. At a two-day UNESCO conference, Iraqi officials are asking for money and expertise to reclaim the cultural heritage that is on the verge of complete destruction by the Islamic State group. (AP Photo/Antonio Castaneda, File)

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FILE - In this Wednesday, Nov. 16, 2016 file picture, part of the damaged ancient site of Nimrud, which were destroyed by the Islamic State militants, some 19 miles (30 kilometers) southeast of Mosul, Iraq. At a two-day UNESCO conference, Iraqi officials are asking for money and expertise to reclaim the cultural heritage that is on the verge of complete destruction by the Islamic State group. (AP Photo/Hussein Malla, File)

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This image released by the Thiqa News Agency shows damaged cars after a suicide attacker blew his small pick-up truck outside a security office in Sousian village, about 8 kilometers (5 miles) north of al-Bab, Friday, Feb. 24, 2017. A car bombing north of a Syrian town just captured by Turkish forces and Syrian opposition fighters from the Islamic State group killed several people, mostly civilians who had gathered trying to go back home, Turkey's news agency and Syrian activists said. (Thiqa News Agency, via AP)

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FILE - In this Feb. 15, 2017, file photo, a load of rocks is dropped to patch a crater as repairs are made on the Tyler Island levee near Isleton, Calif. Billions of dollars of flood projects in the past two decades have eased fears of levee breaks in Sacramento and other Central Valley cities. But flood experts say levees protecting farms and farm towns also need billions of dollars in maintenance and upgrades. (AP Photo/Rich Pedroncelli, File)

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FILE - In this Feb. 15, 2017, file photo, a load of rocks is dropped to patch a crater as repairs are made on the Tyler Island levee near Isleton, Calif. Billions of dollars of flood projects in the past two decades have eased fears of levee breaks in Sacramento and other Central Valley cities. But flood experts say levees protecting farms and farm towns also need billions of dollars in maintenance and upgrades. (AP Photo/Rich Pedroncelli, file)

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FILE - In this Feb. 14, 2017, file photo, crews from Teichert Construction, the California Department of Water Resources and MBK Engineers shore up a section of levee along the Sacramento River in Verona, Calif. Billions of dollars of flood projects in the past two decades have eased fears of levee breaks in Sacramento and other Central Valley cities. But flood experts say levees protecting farms and farm towns also need billions of dollars in maintenance and upgrades. (Chris Kaufman/The Appeal-Democrat via AP, File)

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in this Dec. 13, 2016 photo Serge Myers, right, speaks to George Niland, center, as their attorney, Monte Beck reads a legal document in Opportunity, Mont. Niland and Myers are among the dozens of residents of this small community who are suing for the right to clean the toxic metals left by the smelter from their yards and claim federal environmental officials and the smelter's owner have botched a 34-year cleanup. (AP Photo/Matt Volz)

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This Dec. 13, 2016 photo shows the former Anaconda smelter smokestack behind a gate barring access to the contaminated site in Anaconda, Mont. Residents in the nearby community of Opportunity are suing for the right to clean the toxic metals left by the smelter from their yards and claim federal environmental officials and the smelter's owner have botched a 34-year cleanup. (AP Photo/Matt Volz)

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In this Dec. 13, 2016 photo, Rob Phillips poses under a gate at his home with the old Anaconda smelter smokestack in the distance in Opportunity, Mont. Phillips is one of dozens of residents who are suing for the right to remove arsenic and other toxic metals from their land after they say federal officials and the smelter's owner botched the 34-year environmental cleanup. (AP Photo/Matt Volz)

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This Dec. 13, 2016 photo shows the old Anaconda smelter smokestack in the background behind the community of Opportunity, Mont. Dozens of residents from the community say federal environmental officials and the smelter's owner have botched a 34-year cleanup of arsenic and other toxic metals from the land, and they are suing for the right to clean their yards themselves. (AP Photo/Matt Volz)

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This Dec. 13, 2016 shows the former Anaconda smelter smokestack behind sculptures of miners at the Anaconda Smelter Stack State Park viewing area in Anaconda, Mont. Residents in the nearby community of Opportunity are suing for the right to clean the toxic metals left by the smelter from their yards and claim federal environmental officials and the smelter's owner have botched a 34-year cleanup. (AP Photo/Matt Volz)

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FILE - In this Aug. 21, 2016 file photo, artists perform during the closing ceremony in the Maracana stadium at the 2016 Summer Olympics in Rio de Janeiro, Brazil. Rio's electricity utility has turned the power back on at the famous Maracana stadium after it was shut off for almost a month in a dispute over $1 million in unpaid bills. The utility on Thursday, Feb. 23, 2017 said power had been restored after the stadium operator paid 1.3 million reals ($430,000) in late bills from November through January. It was shut off on Jan. 26 in the dispute. (AP Photo/Chris Carlson, File)

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FILE - In this December 2016 file photo provided by the U.S. Forest Service, B.J. Hill from Swift Creek Outfitters helps rescue his horse, Valentine, from a remote area in northwestern Wyoming. Valentine spent eight weeks in the wilderness after being left behind by an excursion company after getting sick. Prosecutors announced Thursday, Feb. 23, 2017 that they haven't found any evidence of criminal wrongdoing in the case. (U.S. Forest Service via AP, File)