"Marine ecology is a branch of ecology dealing with the interrelations of organisms living in the oceans, shallow coastal waters and on the seashore. Organisms interact through the roles they play as producers, consumers, and decomposers. Primary producers are plants that take inorganic carbon dioxide and water and through the process of photosynthesis make organic materials (sugars) using light energy from the sun. They are the first step of the...

In this multi-award-winning film, Rob Stewart embarks on a global journey to uncover the grave dangers threatening the world's oceans -- and ultimately, humanity -- as well as to learn what it will take to reverse the challenges to life on earth. From the coral reefs in Papua New Guinea to the rainforests of Madagascar, Stewart's travels reveal that our fate is tied to even the smallest of creatures. Stunning scenes of underwater sea life bring viewers...

This two-parter examines the huge project now restoring the Nisqually River, from its source on Mount Rainier to the estuary in Puget Sound. Led by the Nisqually Indian tribe, the restoration aims to fill the river once again with abundant, magnificent wild salmon.

In a two-part special, Carl Safina goes to sea with some of the last remaining swordfish harpooners to experience firsthand one of the world's most sustainable fisheries and to find out why swordfish are the world's best big-fish comeback story.

In the rich fishing grounds of New England and Canada, it seemed as if cod would never run out - until they did. Fishing communities from Newfoundland to Massachusetts fell apart. Widespread closures in the 1990s aimed to let the cod recover, but it's been a long wait. Carl Safina goes fishing to find some of the first signs that the famous codfish just might, indeed, be coming back.

Lionfish are beautiful, colorful reef fish found throughout the Indian and Pacific oceans - that's the good news. The bad news is they're now found all over the Caribbean Sea and the Atlantic coasts of North and South America as well. Alien to those waters, lionfish are the perfect invasive species - aggressive, without predators, prolific breeders and tolerant of a wide range of conditions.

Saving the ocean is not just another doom-and-gloom TV show; it's about people solving problems. The news is grim: overfishing, pollution, coral reef troubles, and on and on. These problems are spread all over the two-thirds of the globe that is ocean. But a far-flung group of unsung heroes - scientists, conservationists, local communities - are hard at work inventing, advocating, and implementing solutions.

The conclusion of this two-part episode examines the huge project now restoring the Nisqually River, from its source on Mount Rainier to the estuary in Puget Sound. Led by the Nisqually Indian tribe, the restoration aims to fill the river once again with abundant, magnificent wild salmon.