MNN Galleries

8 wilderness icons under threat

Polar bears

Photo: explore.org

5 of 10

Polar bears

The polar bear, which relies almost entirely on the marine sea ice environment for its survival, has been affected dramatically by climate change. As the ice melts, polar bears have less access to their prey, ultimately leading to lower production rates for adults and a higher mortality rate for their young. You can watch a live stream of Siku the polar bear, an ambassador for his species, every day from 9 a.m. to 11 a.m. EST.