Why are nearly half of the world's wildlife species facing extinction within the next few decades?

The ninth episode of this acclaimed environmental series is an investigation of one of the most critical questions of the 21st century: why are nearly half of the world's wildlife species facing extinction within the next few decades? Specific case studies explore the loss of wildlife as a result of climate change, population and poverty pressures, poaching, and the international bush-meat trade. Spectacular wildlife photography presents viewers with a celebration of the beauty and diversity of the natural world in such locations as the high country of Montana, Florida's Everglades, Singapore, Kenya, Zambia, the Amazon, Istanbul, the Arctic and China. Academy-Award winner Matt Damon hosts and narrates.