Aerial closeup of Pasterze glacier cracked surface partly covered by debris at the foot of the Grossglockner Mountain in High Tauern National Park, Austria

closeup aerial pasterze glacier melting debris eastern alps retreating austria frozen crevasses summer geography oldest extinction fossil fuel climate boiling rock grossglockner climate change greenhouse gas el nino mountain evolution earth ice surface atmosphere moraine ice sheet alpine co2 cracked valley glacier himalayas ecosystem habitat global warming carbon emission deglaciation climate crisis geohazard texture biodiversity austrian basins high tauern national park environmental damage mineral deposit