This photo provided by the Bancroft Arnesen Explore shows Ann Bancroft of Minnesota talking on a satellite phone during a North Pole expedition with Norwegian Liv Arnesen in Ward Hunt Island, Canada, Tuesday, March 6, 2007. What was intended to be a 530 mile (853 kilometers) trek across the Arctic Ocean to bring attention to global warming was called off March 10, after Arnesen suffered frostbite in three of her toes.

(AP Photo/Bancroft Arnesen Expedition, Hunter Bancroft)