Reuters: Under threat from a thaw of Arctic sea ice, polar bears seem to be having a population explosion at UN climate talks on the tropical island of Bali. Environmental activists have repeatedly paraded in polar bear suits at Dec. 3-14 UN talks to warn of climate threats to wildlife. Yet the UN climate panel says 20 to 30 percent of all species may face more risks of extinction from warming. So should activists focus more on other threatened species closer at hand in Asia, such as …