Aerial view of Glacier tongue in the Eastern Alps, Austria

aerial grossglockner pasterze melting glacier moraine austria debris cracked eastern alps global warming climate change frozen famous crevasses ice cave summer tongue nature extinction landform mountain range oldest mud fossil fuel climate boiling greenhouse gas el nino evolution ice earth retreating icefield ice sheet disaster alpine valley glacier himalayas ecosystem habitat carbon emission deglaciation climate crisis geohazard biodiversity austrian high tauern national park destroyed landscape