Planet Reef

Of the seven species of sea turtles, all are classified as vulnerable, endangered or on the verge of extinction. The degradation of spawning grounds is one of the main reasons.

Since the 1990s, the world has lost almost a third of its coral reefs. Without reefs, half of the world's marine and coastal species would be doomed to extinction.

Explores how huge eaters of plankton, like whales, manta rays, and whale sharks, help regulate the climate and restore reef productivity.