The ocean produces 70 percent of the Earth's oxygen and drives our weather and the chemistry of the planet. Most of the creatures on Earth live in the sea. But our knowledge of the ocean is far outstripped by our impact on it.
Welcome to the National Geographic video player.
You need the latest Flash Player version from Abode and a JavaScript enabled browser to view this site. Please click here to download the free flash player.
© 1996-2009 National Geographic Society. All rights reserved.