Video: Satellites tracking the global melt

Fascinating video explaining how environmental monitoring satellites are tracking global warming by watching polar ice melt.

A study of polar bears in the south Beaufort Sea, which spans the northern coasts of Alaska and western Canada, found that adult males weigh less and have smaller skulls than those captured and measured two decades ago.

The study does not directly blame the changes on a decline in sea ice. However, fewer cubs and smaller males are consistent with other observations that suggest changes in sea ice may be adversely affecting polar bears.

From LiveScience: Watch the video