Kristina Gjerde: How do we monitor the open ocean? Using technology from space exploration.

Barton Seaver: Just because there’s cod at the counter, doesn’t mean there’s enough cod in the sea.

Damien Rice: “We have 12 minutes 37 seconds to write a song. Give me a chord and name an emotion.”

Enric Sala: In a marine protection area, the fish come back after 5 to 7 years. The system recovers.

Photos: TED / James Duncan Davidson