Allan Hills (IMAGE)

Princeton University

Allan Hills

Caption

The researchers collected the 2 million-year-old ice cores in the remote Allan Hills, where high winds help create the environmental conditions that draw ancient ice toward the surface. They found that although a long-term decline in atmospheric carbon dioxide did not directly lead to today's colder glacial cycle, temperature and global ice volume nonetheless tracked carbon dioxide closely.

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(Photos by Sean Mackay, Boston University)

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