Around the globe, scientists are racing to solve a series of mysteries. They suspect we have entered a time of global change swifter than any human being has ever witnessed. Where are we headed? Can we alter this course of events?

Special features: photos of a changing earth; environmental quiz.

Volume 1: episode 1.Invaders -- episode 2. The one degree factor -- Volume 2: episode 3. Predators -- episode 4. Troubled waters.