In this Nov. 22, 2012 photo released by scientist Nancy Bertler, scientists and staff work on ice cores they've collected, on Roosevelt Island, Antarctica. The team dug a trench in the snow to work from. Antarctica's pristine habitat provides a laboratory for scientists studying the effects of climate change. (AP Photo/Courtesy Nancy Bertler)

Associated Press
In this Nov. 22, 2012 photo released by scientist Nancy Bertler, scientists and staff work on ice cores they've collected, on Roosevelt Island, Antarctica. The team dug a trench in the snow to work from. Antarctica's pristine habitat provides a laboratory for scientists studying the effects of climate change. (AP Photo/Courtesy Nancy Bertler)
In this Nov. 22, 2012 photo released by scientist Nancy Bertler, scientists and staff work on ice cores they've collected, on Roosevelt Island, Antarctica. The team dug a trench in the snow to work from. Antarctica's pristine habitat provides a laboratory for scientists studying the effects of climate change. (AP Photo/Courtesy Nancy Bertler)
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