CBS: It's a bleak revelation -- a new study reveals that about a tenth of the Earth's wilderness has been lost since the 1990s. Over the last 20 years, a total area half the size of the Amazon and twice the size of Alaska has been depleted.
The researchers behind the study, published in the journal Current Biology, say they hope that the sobering revelation that rich natural habitats like the Amazon have been decimated in a relatively short amount of time will act as a wakeup call to global leaders...