James Cameron, director of "Avatar," talks about many of the contributions that NASA's Earth science program has made in regards to environmental awareness and exploration of our home planet. "A Planet in Peril" is one of three public service announcements featuring "Avatar" film imagery and computer animations and data from NASA's fleet of Earth-observing satellites. NASA has 14 science satellites in orbit making cutting-edge global observations of the entire global system including the atmosphere, oceans, land surface, snow and ice.

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