AP Wire | 03/12/2007 | Frostbite, equipment damage end latest Bancroft-Arnesen trek

MINNEAPOLIS - A North Pole expedition meant to bring attention to global warming was called off after one of the explorers got frostbite.

The explorers, Ann Bancroft and Liv Arnesen, on Saturday called off what was intended to be a 530-mile trek across the Arctic Ocean after Arnesen suffered frostbite in three of her toes, and extreme cold temperatures drained the batteries in some of their electronic equipment.

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Then there was the cold - quite a bit colder, Atwood said, then Bancroft and Arnesen had expected. One night they measured the temperature inside their tent at 58 degrees below zero, and outside temperatures were exceeding 100 below zero at times, Atwood said.

"My first reaction when they called to say there were calling it off was that they just sounded really, really cold," Atwood said.

She said Bancroft and Arnesen were applying hot water bottles to Arnesen's foot every night, but had to wake up periodically because the bottles froze.

The explorers had planned to call in regular updates to school groups by satellite phone, and had planned online posts with photographic evidence of global warming. In contrast to Bancroft's 1986 trek across the Arctic with fellow Minnesota explorer Will Steger, this time she and Arnesen were prepared to don body suits and swim through areas where polar ice has melted.

Atwood said there was some irony that a trip to call attention to global warming was scuttled in part by extreme cold temperatures.