Polar bears losing crucial sea ice: study, Sea ice
Polar bears now eat dolphins, thanks to global warming - CBS News
Half the World's Orcas Could Soon Disappear Thanks to PCB Pollution
Researchers observe polar bear eating dolphin, says climate change affecting interaction of different species
Polar Bears Are Starving Because of Global Warming, Melting Sea Ice, Study Shows
Climate change forces polar bears to eat dolphins for first time ever, World, News