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Arapaho Glacier

Arapaho Glacier
Arapaho Glacier

Citizen scientist records retreat of Colorado glaciers one ski run at a time

Public policy analyst Jonah Siefer has skied every month of the last three years and his casual observations mirror those of climate scientists tracking the loss of ice fields.


50,000 old photos in Golden are helping scientists answer new questions about climate change

American Alpine Club library's archive of images by early mountaineers holds clues for researchers documenting the retreat of glaciers worldwide