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One fifth of human kind depend on fish to live. Today now 70 percent of the fish stock are over-exploited. According to FAO if we don't change our system of fishing the main sea resources will be gone in 2050. We don't want to believe what we know.

If we wipe out the fish, the oceans are going to die. If the oceans die, we die. We can't live on this planet with a dead ocean.

I don't see a sea change by 2020, but I see migration in the direction of modernization and more flexibility in the generating system going forward.

There are so many issues in our oceans - like the near extinction of blue fin tuna - that should be taken more seriously worldwide.

The ocean is the lifeblood of our world. If we were to lose our fish that we appreciate so much by overfishing; or if we were to lose some of our favorite beaches to overbuilding and pollution, then how would we feel? It's become a case of not knowing what you've got until it's gone.

I'm hopeful that we'll be able to study the ocean before we destroy it.

Remove the predators, and the whole ecosystem begins to crash like a house of cards. As the sharks disappear, the predator-prey balance dramatically shifts, and the health of our oceans declines.

Every fish in the ocean is in danger.

Ten percent of the big fish still remain. There are still some blue whales. There are still some krill in Antarctica. There are a few oysters in Chesapeake Bay. Half the coral reefs are still in pretty good shape, a jeweled belt around the middle of the planet. There's still time, but not a lot, to turn things around.

Our oceans are facing innumerable threats - from overfishing and pollution to ocean acidification and invasive species - yet we haven't had a blueprint for its use and development, incredible as that seems.