RT @USGS: Columbia Glacier in southern Alaska has retreated 20 km (12 miles) and lost over half its volume since the 1980s. One of the fastest retreating glaciers globally, its drastic change is captured by NASA & USGS Landsat satellites. See more: https://t.co/DieY84LLUc #SnowyScience https://t.co/MVFwOXY9Jw USGS Landsat Climate Change Science on Telegram by @ClimateChangeScience A @grttme project - Other backups: @Hallotme