National Geographic Magazine
"Last Ones: America's Endangered Species"
Last Ones: Polar Bear
Beasts without boundaries, polar bears journey across the ice and through the seas from Russia to Alaska, Canada to Greenland, and onto the Svalbard archipelago. Once most threatened by hunters, the bears, which number some 22,000 across their range, are now being stressed by melting sea ice due to climate change. Populations are declining in some areas, and distribution is changing across the north.