melting ice threatens endangered polar bear in heartbreaking arctic scene

polar bear melting ice endangered species wildlife arctic climate change environmental impact heartbreaking stranded floe vast ocean cloudy sky natural light high contrast global warming habitat loss ecosystem survival threatened vulnerable extinction animal welfare conservation melt sea level rise carbon emissions greenhouse gases pollution acidification biodiversity food chain hunting fishing marine life nature wilderness cold snow iceberg glaciers tundra northern hemisphere world kingdom circle north pole crisis earth 039 future