No water, no life. No blue, no green.

We might set up house on Mars but ... we do very little exploring the blue part of the planet. We have done so much skyward, I would like to see us spend more money and effort to explore below us.

When I first ventured into the Gulf of Mexico in the 1950s, the sea appeared to be a blue infinity too large, too wild to be harmed by anything that people could do.

'Green' issues at last are attracting serious attention, owing to critically important links between the environment and the economy, health, and our security.

With every drop of water you drink, every breath you take, you're connected to the sea. No matter where on Earth you live. Most of the oxygen in the atmosphere is generated by the sea.

Why is it that scuba divers and surfers are some of the strongest advocates of ocean conservation? Because they've spent time in and around the ocean, and they've personally seen the beauty, the fragility, and even the degradation of our planet's blue heart.