3. Nunavut, Canada

Nunavut, Canada  [huanqiu.com]

For thousands of years, the Nunavut is not only the home to the Inuit, but also the paradise of walruses, polar bears, and seals. The habitants there can co-exist harmoniously, and they all rely on the ice.

But rising temperature are expected to keep the sea ice melted, threatening the region's wildlife and indigenous population.