Aerial closeup of Pasterze glacier melting ice cave due to climate change, Retreating glacier of Austrian Alps, Austria

aerial closeup ice cave pasterze glacier melting retreating broken austria eastern alps frozen crevasses summer geography lagoon oldest mountain fossil fuel extinction debris climate boiling vanishing landscape climate change greenhouse gas el nino evolution earth ice surface ice sheet drone shot alpine cracked valley glacier himalayas ecosystem habitat global warming carbon emission deglaciation climate crisis geohazard texture fresh water biodiversity austrian basins high tauern national park environmental damage