Polar bears are at a risk of becoming extinct due to global warming. Their habitats, which are the polar ice caps, are being destroyed by melting due to warming temperatures. Polar bears are having to swim further and further to find an ice cap to hunt seals on. Seals are a polar bears main food source, without the ice caps they are unable to feed and many are starving. Melting ice is also coming sooner the summers are longer and winters are shorter leaving polar bears less time to store food to hold them off.