close-up of a polar bear resting peacefully in the water resting on a small piece of ice in the arctic sea among icebergs. concern

close up portrait polar bear iceberg arctic resting peaceful global warming climate change svalbard wilderness glacier floating melting ice endangered wild water nap species wildlife rest habitat environmental nature conservation survival ecosystem vulnerability fragile threatened vulnerable sea biodiversity sleep solitude frozen adaptation animal snow predator canada napping environment freezing carnivore fauna