The ice keeper

The ice keeper

The Science Life

By Alexandra Witze, 16:14 PM May 2, 2013

DENVER — “I’m a little tired of the cold,” Geoff Hargreaves says with a sigh.

No surprise there: Hargreaves works in a deep freeze — 38 degrees Celsius below zero (−36° F). As curator of the National Ice Core Laboratory, his job is to keep ice cores from Antarctica and Greenland frozen.

These cylinders — which would stretch more than 17,000 meters if laid end-to-end — are precious. They contain records of past climate and atmospheric chemistry, trapped in tiny bubbles that formed thousands...

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