In summary, the most serious threats to the future of the polar bear are destruction of their habitat through oil and gas exploration and significantly through climate change, interference by tourists and pollution of the sea. If these causes are not restricted, the population of this great bear will continue to decline.
Scientists predict that if current trends continue, the polar bear population will shrink by two-thirds by the year 2050 and faces a high risk of extinction by the end of the 21st century.
For further information see:
Polar Bears International
World Wildlife - Polar bears
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