We must alert and organise the world's people to pressure world leaders to take specific steps to solve the two root causes of our environmental crises - exploding population growth and wasteful consumption of irreplaceable resources. Overconsumption and overpopulation underlie every environmental problem we face today.

The road to the future leads us smack into the wall. We simply ricochet off the alternatives that destiny offers. Our survival is no more than a question of 25, 50 or perhaps 100 years.

I was playing when I invented the aqualung. I think play is the most serious thing in the world.

We must plant the sea and herd its animals using the sea as farmers instead of hunters. That is what civilization is all about - farming replacing hunting.

The biggest obstacle was mixing abortion with overpopulation. These are two things that have nothing to do with each other.

However fragmented the world, however intense the national rivalries, it is an inexorable fact that we become more interdependent every day.

The impossible missions are the only ones which succeed.