Colorado has a giant freezer filled with polar ice

Welcome to the US National Ice Core Laboratory in Denver, Colorado, where there's a giant freezer filled with 20km of ice cores from Greenland and the Antarctic. Here's why.

Thanks to everyone at the US National Ice Core Laboratory! You can find out more about them here: http://icecores.org/

The Ice Core Laboratory is supported by the National Science Foundation: https://www.nsf.gov/

Edited by Michelle Martin, @onthecrux

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