According to the World Wide Fund, the polar bear could be faced extinction and a large number of other animals reduced very small remnant populations by global warming in Artic regions.
Warmer winters are responsible the thinning or disappearance of ice sheets in many parts of the Artic, resulting a situation where polar bears are risk of starvation because they cannot travel to their normal breeding and hunting grounds.
Even in places where there is still much ice around, polar bears are threat because they rely snow caves to rear their young. Due to the warmer weather, these caves are prone sudden collapse, burying the youngsters .
Other effects of the changes climate are also being noticed. Animals such as reindeer (also known ‘caribou’ in North America) have adapted the extreme cold and are able to cope the Artic climate. For millions of years they have been migrating to places where they can breed and find food. These migrations coincide the growing season for the plants they feed . Ecologists have found, however, that they are now arriving their spring feeding grounds too late. The plants they eat have grown and gone to seed. This is having a serious impact the herds of caribou. A substantial number of calves are being lost and there is already a substantial reduction herds. Scientists are concerned, but powerless to do anything response to the situation - everything they have tried has been vain. It is simply one of the unforeseen consequences of global warming.