Every year since 1973, Alaska has celebrated the virtues of perseverance and fortitude by hosting the Iditarod, a 1,000-mile (1,610-km) dog sled race across the state's frozen wilderness that pushes its participants to the limits of endurance. But Alaska is much less frozen than it was 50 years ago. The state has warmed at more than twice the global rate, altering the Anchorage-to-Nome race along with nearly every aspect of life in the far north. "Alaska is a bit of a poster child for global warming," said Rob Urbach, chief executive of the Iditarod Sled Dog Race, which holds its traditional ceremonial start in Alaska's largest city on Saturday. Nearly 50 mushers and their dogs have registered to compete in the race. The Joe Redington Sr. Memorial Trail, named for the homestea...
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