Environment

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**FILE** Singer Katy Perry attends Billboard's Women in Music 2012 luncheon at Capitale in New York on Nov. 30, 2012. (Associated Press/Invision)

Officials work the scene of derailed freight train tank cars in Paulsboro, N.J., Friday, Nov. 30, 2012. People in three southern New Jersey towns were told Friday to stay inside after a freight train derailed and several tanker cars carrying hazardous materials toppled from a bridge and into a creek. At least one tanker car may contain vinyl chloride, Gloucester County Emergency Management director J. Thomas Butts told WPVI-TV. (AP Photo/Mel Evans)

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An official stands by derailed freight train tank cars in Paulsboro, N.J., Friday, Nov. 30, 2012. People in three southern New Jersey towns were told Friday to stay inside after a freight train derailed and several tanker cars carrying hazardous materials toppled from a bridge and into a creek. At least one tanker car may contain vinyl chloride, Gloucester County Emergency Management director J. Thomas Butts told WPVI-TV. (AP Photo/Mel Evans)

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Officials stand next to derailed freight train cars in Paulsboro, N.J., Friday, Nov. 30, 2012. People in three southern New Jersey towns were told Friday to stay inside after a freight train derailed and several tanker cars carrying hazardous materials toppled from a bridge and into a creek. At least one tanker car may contain vinyl chloride, Gloucester County Emergency Management director J. Thomas Butts told WPVI-TV. (AP Photo/Mel Evans)

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Officials stand by derailed freight train tank cars in Paulsboro, N.J., Friday, Nov. 30, 2012. People in three southern New Jersey towns were told Friday to stay inside after a freight train derailed and several tanker cars carrying hazardous materials toppled from a bridge and into a creek. At least one tanker car may contain vinyl chloride, Gloucester County Emergency Management director J. Thomas Butts told WPVI-TV. (AP Photo/Mel Evans)

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Officials stand next to derailed freight train cars in Paulsboro, N.J., Friday, Nov. 30, 2012, after several tanker cars carrying hazardous materials toppled from a bridge and into a creek. At least one tanker car may contain vinyl chloride, Gloucester County Emergency Management director J. Thomas Butts told WPVI-TV. (AP Photo/Mel Evans)

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** FILE ** Sen. Kelly Ayotte, New Hampshire Republican, speaks with reporters after a closed-door meeting with U.N. Ambassador Susan E. Rice about the deadly Sept. 11 raid in Libya, at the Capitol in Washington on Tuesday, Nov. 27, 2012. (AP Photo/J. Scott Applewhite)

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The Korea Space Launch Vehicle-1 sits on its launch pad at the Naro Space Center in Goheung, South Korea, on Thursday, Nov. 29, 2012. South Korea on Thursday scrapped an attempt to fire its first satellite into orbit from its own soil amid speculation that North Korea was preparing to fire its own long-range rocket. (AP Photo/Yonhap, Shin Jun-hee)

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The Rockefeller Center Christmas Tree is lit during the 80th annual tree lighting ceremony at Rockefeller Center in New York, Wednesday, Nov. 28, 2012. (AP Photo/Kathy Willens)

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Craftmark Homes is building 16 single-family homes at Fairview Manor in Bowie. The Kenwood model, which has 5,136 square feet, is priced from $656,900.

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A white rhinoceros grazes in Nairobi National Park in Kenya. Africa’s rhinos are being killed in record numbers for their horns, and the problem is especially dire in South Africa, which contains about 90 percent of the rhinos on the continent. Poaching there has soared from 15 a year in 2007 to 588 so far this year. Asians, especially Vietnamese, pay the equivalent of the U.S. street value of cocaine for the horns, whose keratin is reputed to cure cancer and also ease hangovers and fever. (Associated Press)

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In this photo released by the Syrian official news agency SANA, a Syrian soldier (right) and others gather at an alley that was destroyed by two cars bombs in Jaramana neighborhood of Damascus, Syria, on Wednesday, Nov. 28, 2012. (AP Photo/SANA)