http://www.biologynews.net/archives/2010/12/15/polar_bears_on_thin_ice_extinction_can_be_averted_scientists_say.html
Poler bears were added to the threatened species list three years ago. The species look like there never going to come all the way back. researchers say they will continue to decline over the next ears untill there extinct. Scientists say that global warming is the main cause of the decrease. Green house gasses get trapped then cause the weather to be warmer then the ice melts.

Polar bears would be a big loss because we would know that we killed them. Are use of machinary caused them all to die out. Scientists are right in telling us how the Polar bears die. Science never lies.