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GLAMIS, CA - JULY 20: The rising sun illuminates the Algodones Dunes, also known as the Imperial Dunes or American Sahara, on July 20 near Glamis, California in the Colorado Desert between Brawley, California and Yuma, Arizona. The Center for Biological Diversity is leading a coalition of 12 environmental groups in a legal challenge to the Bush Administration's plans to open 49,300 acres of endangered species habitat on the Algodones Dunes to intensive off-road vehicle use. The Bureau of Land Management closed 49,300 acres to off-road vehicles in November, 2000 to protect endangered species, including desert tortoises and several endangered plants that occur only at these dunes. (Photo by David McNew/Getty Images)

GLAMIS, CA - JULY 20:  The rising sun illuminates the Algodones Dunes, also known as the Imperial Dunes or American Sahara, on July 20 near Glamis, California in the Colorado Desert between Brawley, California and Yuma, Arizona. The Center for Biological Diversity is leading a coalition of 12 environmental groups in a legal challenge to the Bush Administration's plans to open 49,300 acres of endangered species habitat on the Algodones Dunes to intensive off-road vehicle use. The Bureau of Land Management closed 49,300 acres to off-road vehicles in November, 2000 to protect endangered species, including desert tortoises and several endangered plants that occur only at these dunes.  (Photo by David McNew/Getty Images)