Sylvia Earle, National Geographic Explorer-in-Residence
Enric Sala, marine ecologist and National Geographic Fellow
The world's ocean ecosystems are as diverse as forests and deserts on land. While resilient, these systems are under stress from pollution, overfishing and climate change — and some experts say it may be too late to repair the damage. In a special broadcast with National Geographic, two premier explorers explain the state of the world’s oceans and its habitats.