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One of the world's leading polar bear experts has been told to stay away from an international conference on the animals because his views are "extremely unhelpful," according to an e-mail by the chairman of the Polar Bear Specialist Group, Dr. Andy Derocher.

The London Telegraph reports Canadian biologist Mitchell Taylor has more than 30 years of experience with polar bears. But his belief that global warming is caused by nature, not man, led officials to bar him from this week's polar bear specialist group meeting in Denmark.

Taylor says the polar bear population has actually increased over the last 30 years. He says the threat to them by melting Arctic ice — illustrated by a famous photo taken by photographer Amanda Byrd — has become the most iconic cause for global warming theorists. The photo is often used by former Vice President Al Gore and others as an example of the dangers faced by the bears. But it was debunked last year by the photographer, who says the picture had nothing to do with global warming, and that the bears were not in danger. The photographer said she just happened to catch the bears on a small windswept iceberg.