Environment

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In this Jan. 14, 2017, photo provided by Hubbard Brook Research Foundation, a firefighting hose mounted on an ATV sprays water on trees 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 Sunday, Jan. 15, 2017 photo, ice coats trees in the Hubbard Brook Experimental Forest in Woodstock, N.H., the morning after researchers sprayed them with water to study the effects of ice on northern forests. (AP Photo/Holly Ramer)

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In this Sunday, Jan. 15, 2017 photo, a sign warns visitors to the Hubbard Brook Experimental Forest in Woodstock, N.H., about the danger of falling ice the morning after researchers sprayed trees with water to study the effects of ice on northern forests. (AP Photo/Holly Ramer)

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In this Sunday, Jan. 15, 2017 photo, USDA Forest Service researchers Paul Schaberg, left, and Lindsey Rustad, right, examine the aftermath of a manufactured ice storm at the Hubbard Brook Experimental Forest in Woodstock, N.H. A team of scientists sprayed water on the trees the night before as part of a study designed to examine the effects of ice on northern forests. (AP Photo/Holly Ramer)

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Syracuse's Tyus Battle shoots before an NCAA college basketball game against Wake Forest in Syracuse, N.Y., Tuesday, Jan. 24, 2017. (AP Photo/Nick Lisi)

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A Hawaiian monk seal called Hoailona watches visitors from his enclosure at the Waikiki Aquarium in Honolulu on Tuesday, Jan. 24, 2017. Federal wildlife biologists say the population of endangered Hawaiian monk seals has grown 3 percent a year for the past three years to 1,400. (AP Photo/Audrey McAvoy)

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School children watch a Hawaiian monk seal called Hoailona at the Waikiki Aquarium in Honolulu on Tuesday, Jan. 24, 2017. Federal wildlife biologists say the population of endangered Hawaiian monk seals has grown 3 percent a year for the past three years to 1,400. (AP Photo/Audrey McAvoy)

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FILE - This Sept. 15, 2016 file photo shows a Hawaiian monk seal, an endangered species, on a Waikiki beach in Honolulu. Federal wildlife biologists say the population of endangered Hawaiian monk seals has grown 3 percent a year for the past three years. (AP Photo/Audrey McAvoy)

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A child watches a Hawaiian monk seal called Hoailona at the Waikiki Aquarium in Honolulu on Tuesday, Jan. 24, 2017. Federal wildlife biologists say the population of endangered Hawaiian monk seals has grown 3 percent a year for the past three years to 1,400. (AP Photo/Audrey McAvoy)

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FILE -This August 2016 file photo provided by the National Marine Fisheries Service shows a prematurely weaned Hawaiian monk seal pup being restrained by a veterinarian so he may be fed a mashed fish formula aboard the research vessel Oscar Elton Sette in Kailua-Kona, Hawaii. Federal wildlife biologists say the population of endangered Hawaiian monk seals has grown 3 percent a year for the past three years. (National Marine Fisheries Service via AP)

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FILE - In this Jan. 9, 2014, file photo, rail cars are filled with coal and sprayed with a topper agent to suppress dust at Cloud Peak Energy's Antelope Mine north of Douglas, Wyo. Six of the country's major energy-producing states have slipped into recession after a sharp decline in production and exploration over the last 18 months caused their tax revenue to plummet, according to a financial analysis released Tuesday, Jan. 24, 2017. (Ryan Dorgan/Casper Star-Tribune via AP, File)

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FILE - In this Feb. 9, 2016, file photo, ice forms on pipelines built near the Colville-Delta 5 field, or as it's more commonly known, CD5, drilling site on Alaska's North Slope in Nuiqsut, Alaska. Six of the country's major energy-producing states have slipped into recession after a sharp decline in production and exploration over the last 18 months caused their tax revenue to plummet, according to a financial analysis released Tuesday, Jan. 24, 2017. (AP Photo/Mark Thiessen, File0

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FILE 0 This Feb. 9, 2016, file photo, shows a million-pound drilling rig looming in the distance at the CD5 drilling site on Alaska's North Slope in Nuiqsut, Alaska. Six of the country's major energy-producing states have slipped into recession after a sharp decline in production and exploration over the last 18 months caused their tax revenue to plummet, according to a financial analysis released Tuesday, Jan. 24, 2017. (AP Photo/Mark Thiessen, File)

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ADDS DATE - Debris lies scattered on a lawn on Monday, Jan. 23, 2017, next to a house destroyed by severe weather over the weekend in Cook County, Ga. Nathan Deal declared a state of emergency in several counties, including Cook, that have suffered deaths, injuries and severe damage from weekend storms and expanded it Monday to include additional counties in southern Georgia. (AP Photo/Brendan Farrington)

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ADDS DATE - Mobile homes lie Monday, Jan. 23, 2017, destroyed by severe weather in Cook County, Ga. Gov. Nathan Deal declared a state of emergency in several counties, including Cook, that have suffered deaths, injuries and severe damage from weekend storms and expanded it Monday to include additional counties in southern Georgia. (AP Photo/Brendan Farrington)

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In an Oct. 22, 2015 photo, David A. Roden, owner of Mountain View Estates, speaks about a tornado shelter that he built for his mobile home park residents in Rossville, Ga. Experts have long warned that people in mobile homes face a greater risk of death from tornadoes, yet laws requiring storm shelters in trailer parks or public spaces such as schools are few and far between. Roden believes he is the first park owner in the southeast to offer residents a storm shelter. (Dan Henry/Chattanooga Times Free Press via AP) /Chattanooga Times Free Press via AP)

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An Oct. 22, 2015 photo shows a tornado shelter built by David A. Roden, owner of Mountain View Estates in Chattanooga, for his mobile home park residents in Rossville, Ga. Experts have long warned that people in mobile homes face a greater risk of death from tornadoes, yet laws requiring storm shelters in trailer parks or public spaces such as schools are few and far between. Roden believes he is the first park owner in the southeast to offer residents a storm shelter. (Dan Henry/Chattanooga Times Free Press via AP) /Chattanooga Times Free Press via AP)

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In an Oct. 22, 2015 photo, David A. Roden, owner of Mountain View Estates, speaks about a tornado shelter that he built for his mobile home park residents in Rossville, Ga. Experts have long warned that people in mobile homes face a greater risk of death from tornadoes, yet laws requiring storm shelters in trailer parks or public spaces such as schools are few and far between. Roden believes he is the first park owner in the southeast to offer residents a storm shelter. (Dan Henry/Chattanooga Times Free Press via AP)

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In an Oct. 22, 2015 photo, David A. Roden, owner of Mountain View Estates, speaks about a tornado shelter that he built for his mobile home park residents in Rossville, Ga. Experts have long warned that people in mobile homes face a greater risk of death from tornadoes, yet laws requiring storm shelters in trailer parks or public spaces such as schools are few and far between. Roden believes he is the first park owner in the southeast to offer residents a storm shelter. (Dan Henry/Chattanooga Times Free Press via AP) /Chattanooga Times Free Press via AP)