Enjoy the amazing Planet Earth footage of polar bears, since the incredible animals might be even harder to find in the coming decades. The U.S. Geological Survey announced on Friday that by the year 2050, thinning sea ice in the Arctic will cut the polar population by two-thirds.
The problem is that the bears will lose 42 percent of the territory they roam in the summer, which is when they hunt and breed. Only 16,000 bears remain today, and there won't be any left in Alaska by the century's midpoint.—Gregory Mone
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.