Environment

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North Carolina's Joel Berry II (2) drives to the basket against Wake Forest during the first half of an NCAA college basketball game in Winston-Salem, N.C., Wednesday, Jan. 11, 2017. (AP Photo/Chuck Burton)

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Wake Forest's Doral Moore (4) dunks next to North Carolina's Theo Pinson (1) during the first half of an NCAA college basketball game in Winston-Salem, N.C., Wednesday, Jan. 11, 2017. (AP Photo/Chuck Burton)

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Wake Forest's John Collins (20) shoots over North Carolina's Kennedy Meeks (3) during the first half of an NCAA college basketball game in Winston-Salem, N.C., Wednesday, Jan. 11, 2017. (AP Photo/Chuck Burton)

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South Carolina Gov. Nikki Haley greets lawmakers in the House chamber before delivering the State of the State at the South Carolina Statehouse Wednesday, Jan. 11, 2017, in Columbia, S.C. (AP Photo/Sean Rayford)

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South Carolina Gov. Nikki Haley, left, smiles with Lt. Gov. Henry McMaster, right, after delivering the state of the state in the House chamber at the South Carolina Statehouse Wednesday, Jan. 11, 2017, in Columbia, S.C. (AP Photo/Sean Rayford)

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The Liaoning, China's sole aircraft carrier, held drills in the South China Sea before steaming through a restricted area in the strait between the mainland and Taiwan. (Associated Press)

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FILE - In this Sunday, Jan. 8, 2017 file photo, a tree is seen after falling on resident Jeamean Redd's house on Brookdale Avenue in San Francisco. Drenching winter rains combined with the punishing effects of six years of drought are causing trees to topple across California, in some cases with deadly results. At least two people have been killed in the past month. (Gabrielle Lurie/San Francisco Chronicle via AP, File)

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FILE - In this Dec. 26, 2016, file photo, health officials wearing protective suits carry a sack containing killed chickens after they were slaughtered at a chicken farm where a suspected case of bird flu was reported in Incheon, South Korea. The country is the throes of a spreading bird flu outbreak that has caused the death of about a third of its egg-laying flocks and has asked the United States for the first time to ship it shell eggs. (Yun Tae-hyun/Yonhap via AP, File)

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FILE - In this Dec. 28, 2016, file photo, customers look at eggs at a discount store in Seoul, South Korea, a day after government officials announced that millions of chickens would be culled because of an outbreak of bird flu. Because of the spreading bird flu outbreak, South Korea has asked the United States for the first time to ship it shell eggs. (AP Photo/Ahn Young-joon, File)

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Scott Wagner, a Republican state senator from York County and owner of trash hauling firm Penn Waste, speaks to reporters at a Penn Waste facility after formally announcing that he will run for Pennsylvania governor in 2018, Wednesday, Jan. 11, 2017 in Manchester, Pa. (Dan Gleiter/PennLive.com via AP)

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Scott Wagner, a Republican state senator from York County and owner of trash hauling firm Penn Waste, speaks to reporters at a Penn Waste facility after formally announcing that he will run for Pennsylvania governor in 2018, Wednesday, Jan. 11, 2017 in Manchester, Pa. (Dan Gleiter/PennLive.com via AP)

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Scott Wagner, a Republican state senator from York County and owner of trash hauling firm Penn Waste, speaks to reporters at a Penn Waste facility after formally announcing that he will run for Pennsylvania governor in 2018, Wednesday, Jan. 11, 2017 in Manchester, Pa. (AP Photo/Marc Levy)

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Scott Wagner, a Republican state senator from York County and owner of trash hauling firm Penn Waste, speaks at a Penn Waste facility while formally announcing that he will run for Pennsylvania governor in 2018, Wednesday, Jan. 11, 2017 in Manchester, Pa. (AP Photo/Marc Levy)

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Scott Wagner, a Republican state senator from York County and owner of trash hauling firm Penn Waste, speaks to reporters at a Penn Waste facility after formally announcing that he will run for Pennsylvania governor in 2018, Wednesday, Jan. 11, 2017 in Manchester, Pa. (AP Photo/Marc Levy)

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FILE - In this June 20, 2016 file photo, the full moon rises behind a tree next to the ruins of the ancient marble Temple of Poseidon, built in 444 BC, at Cape Sounion, southeast of Athens, on the eve of the summer solstice. On Wednesday, Jan. 11, 2017, a California-led research team reported that the moon formed within 60 million years of the birth of the solar system. Previous estimates ranged within 100 million years, all the way out to 200 million years of the solar system’s creation. (AP Photo/Petros Giannakouris)

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This Tuesday, Jan. 10, 2017 photo provided by Steven and Melissa Siig shows just one eave of their home barely visible after one of several avalanches, some triggered by authorities, hit Alpine Meadows, Calif., in the north Lake Tahoe area. Officials said there was no major damage and no one was hurt. Several ski resorts in parts of the Sierra Nevada planned to stay shuttered Wednesday, including Squaw Valley and Alpine Meadows, which had no power because of the storm. (Steven and Melissa Siig via AP)

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This Tuesday, Jan. 10, 2017 photo provided by Steven and Melissa Siig shows the home of their neighbor after one of several avalanches, some triggered by authorities, hit Alpine Meadows, Calif., in the north Lake Tahoe area. Officials said there was no major damage and no one was hurt. Several ski resorts in parts of the Sierra Nevada planned to stay shuttered Wednesday, including Squaw Valley and Alpine Meadows, which had no power because of the storm. (Steven and Melissa Siig via AP)

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This Tuesday, Jan. 10, 2017 photo provided by Steven and Melissa Siig shows a door of their home after they dug themselves out after one of several avalanches, some triggered by authorities, hit Alpine Meadows, Calif., in the north Lake Tahoe area. Officials said there was no major damage and no one was hurt. Several ski resorts in parts of the Sierra Nevada planned to stay shuttered Wednesday, including Squaw Valley and Alpine Meadows, which had no power because of the storm. (Steven and Melissa Siig via AP)

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This Tuesday, Jan. 10, 2017 photo provided by Steven and Melissa Siig shows where snow has cascaded through a door of their home after one of several avalanches, some triggered by authorities, hit Alpine Meadows, Calif., in the north Lake Tahoe area. Officials said there was no major damage and no one was hurt. Several ski resorts in parts of the Sierra Nevada planned to stay shuttered Wednesday, including Squaw Valley and Alpine Meadows, which had no power because of the storm. (Steven and Melissa Siig via AP)

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Early morning traffic is at a standstill along Interstate 5 headed into Portland, Ore., Wednesday, Jan. 11, 2017. A major snowstorm spread through Portland and parts of Washington state overnight, toppling trees, closing schools and cutting power to thousands. (AP Photo/Don Ryan)