Environment
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Boulder Police Sgt. Joel Burick works to relocate Blake Marcelle, at center, and other protesters outside the Benson Earth Sciences building before the Milo Yiannopoulos speech on the University of Colorado campus in Boulder, Colo., Wednesday, Jan. 25, 2017. (Jeremy Papasso/Daily Camera via AP)

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United States' Venus Williams serves to compatriot Coco Vandeweghe during their semifinal at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. 26, 2017. (AP Photo/Andy Brownbill)

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In this Jan. 23, 2017, photo, spinach grows inside a high tunnel at Screamin' Ridge Farm in Montpelier, Vt. Demand driven by the farm-to-table movement knows no seasons, so farmers in colder areas of the country increasingly use such structures to meet wintertime demand for local produce. The federal government helped spur growth in winter farming by providing financial and technical assistance to farmers to install the type of greenhouse to extend the growing season. (AP Photo/Lisa Rathke)

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In this Jan. 23, 2017, photo, farmer Joe Buley pulls a weed from a bed of spinach growing in a high tunnel greenhouse at Screamin' Ridge Farm in Montpelier, Vt. Demand driven by the farm-to-table movement knows no seasons, so farmers in colder areas of the country increasingly use such structures to meet wintertime demand for local produce. The federal government helped spur growth in winter farming by providing financial and technical assistance to farmers to install the type of greenhouse to extend the growing season. (AP Photo/Lisa Rathke)

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In this December 2016 photo provided by U.S. Forest Service, B.J. Hill and his son Heath from Swift Creek Outfitters help rescue their horse, Valentine, from a remote area in northwestern Wyoming. The horse was left behind in the Wyoming wilderness by an excursion company after getting sick and survived for six weeks, a case that has raised debate and prompted a criminal investigation. (U.S. Forest Service via AP)

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In this December 2016 photo provided by U.S. Forest Service, B.J. Hill from Swift Creek Outfitters helps rescue his horse, Valentine, from a remote area in northwestern Wyoming. The horse was left behind in the Wyoming wilderness by an excursion company after getting sick and survived for six weeks, a case that has raised debate and prompted a criminal investigation. (U.S. Forest Service via AP)

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In this December 2016 photo provided by U.S. Forest Service, In this December 2016 photo provided by U.S. Forest Service, B.J. Hill and his son Heath from Swift Creek Outfitters stand with their horse, Valentine, after rescuing it from a remote area in northwestern Wyoming. The horse was left behind in the Wyoming wilderness by an excursion company after getting sick and survived for six weeks, a case that has raised debate and prompted a criminal investigation. (U.S. Forest Service via AP)

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As the Chinese protects claims of sovereignty in the South China Sea, the Trump administration will "send a clear signal that, first, the island-building stops and, second, [China's] access to those islands also is not going to be allowed," secretary of state nominee Rex Tillerson said. (Associated Press)

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(Jena Gardner)

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FILE - In this Wednesday, Feb. 18, 2015 file photo, bison stand in a corral at the Stephens Creek Capture facility in Yellowstone National Park in Montana. Montana Gov. Steve Bullock has blocked the impending slaughter of hundreds of Yellowstone National Park bison over disease concerns until a temporary home can be found for 40 animals wanted by an American Indian tribe. (AP Photo/The Billings Gazette, Casey Page,File)

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FILE - This March 9, 2016 file photo a group of Yellowstone National Park bison await shipment to slaughter inside a holding pen along the park's northern border near Gardiner, Mont. Montana Gov. Steve Bullock has blocked the impending slaughter of hundreds of Yellowstone National Park bison over disease concerns until a temporary home can be found for 40 animals wanted by an American Indian tribe. (AP Photo/Matthew Brown,File)

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FILE - In this Wednesday, Jan. 23, 2013 file photograph, artist Christo responds to questions during a show of sketches and photos of some of his in-progress works at the Metropolitan State University Center for Visual Art in Denver. Christo and his late wife, Jeanne-Claude, had won state and federal permits to build a project called "Over the River," which would have involved the suspension of nearly six miles of giant fabric panels from anchors and cables over parts of a 42-mile stretch of the Arkansas River next to U.S. Highway 50. On Wednesday, Jan. 25, 2017, Christo announced that he has abandoned plans to complete the project. (AP Photo/Brennan Linsley, file)

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FILE--In this Feb. 11, 2009, file photograph, artist Christo, right, and his partner, Jeanne-Claude, are shown during a press conference for their exhibition "Over the River, A Work in Progress" at the Fondation de lHermitage in Lausanne, Switzerland. The artists' then-current artwork in progress was called, "Over The River," which proposed the horizontal suspension of fabric panels in separate segments along a stretch above the Arkansas River in southern Colorado. On Wednesday, Jan. 25, 2017, Christo announced that he has abandoned his plans for the display over the Arkansas River. (Keystone/Dominic Favre via AP, file)

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FILE - This Jan. 21, 2017 file photo shows damage to the front of The William Carey University's School of Business after a tornado touched down in Hattiesburg, Miss. The university heavily damaged by a tornado is taking more steps toward recovery. William Carey University wants students to return to campus Wednesday, Jan. 25 through Friday to retrieve personal belongings and cars. (AP Photo/Rogelio V. Solis)

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This photo shows a Twitter post from the National Park Service's Redwoods National Park account. The National Park Service employees' Twitter campaign against President Donald Trump has spread to other parks. A day after three climate-related tweets sent out by Badlands National Park were deleted, other park accounts have sent out tweets. This one, by Redwoods National Park in California, notes that redwood groves are nature's No. 1 carbon sink, which capture greenhouse gas emissions that contribute to global warming. A park service spokesman declined to comment on Jan. 25. (National Park Service via AP)

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FILE - This Aug. 27, 2015, file photo shows a solar power array that is part of sustainability improvements at the Lamar Buffalo Ranch in Yellowstone National Park, Wyo. In recent years, huge solar and wind farms have sprouted up on public desert land in the Western United States buoyed by generous federal tax credits. A group of lawmakers in the most Republican statehouse in the country is bucking the nationwide trend toward stricter renewable energy requirements with a plan to do the opposite: Require utilities to get their electricity from fossil fuels or face fines. (Ryan Jones/Jackson Hole News & Guide via AP, File)

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In this June 1966 photo made available by NASA, the Apollo 1 crew practices water evacuation procedures with a full scale model of the spacecraft at Ellington AFB, near the then-Manned Spacecraft Center, Houston. In the rafts at right are astronauts Ed White and Roger Chaffee, foreground. In a raft near the spacecraft is astronaut Virgil Grissom. (NASA via AP)

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In this Jan. 20, 2017 photo provided by the Texas Parks and Wildlife Department, a former cargo vessel named Kraken sinks more than 60 miles off the coast of Galveston, Texas, to become an artificial reef. The ship is expected to become a home to fish, coral and other invertebrates plus being a destination for divers. (Texas Parks and Wildlife Department via AP)

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In this Jan. 19, 2016 photo provided by Hubbard Brook Research Foundation, researchers gather to measure ice accumulation on wooden collectors in the Hubbard Brook Experimental Forest in Woodstock, N.H. Scientists have been creating ice storms there to help understand the effects of ice on northern forests. (Joe Klementovich/Hubbard Brook Research Foundation via AP)

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In this Jan. 29, 2016 photo provided by Hubbard Brook Research Foundation, wildlife biology student Wendy Leuenberger measures ice accumulation after a team of scientists sprayed water on trees the night before in the Hubbard Brook Experimental Forest in Woodstock, N.H. Scientists have been creating ice storms there to help understand the effects of ice on northern forests. (Joe Klementovich/Hubbard Brook Research Foundation via AP)