Polar bears face extinction from global warming.

    now to the newest victims of global warming: polar bears. According to a new government study， two thirds of all the worlds polar bears could be wiped out by the year 2050. ABCs Bill Blakemone has the story from the Arctic.

    Its formal name is also Ursus Maritimus， Latin for bear of the sea， the source of its food， mostly seals. It can swim vast distances， but in summer， it must have frozen sea surface to rest on and hunt from. The Arctic summer sea ice is disappearing so fast now. The red line is the normal summer minimum from ten years ago; this is 2006; this 2007. The scientists now say the great majority of polar bears will be gone before todays toddlers settle into middle age.