Our little Spaceship Earth is only eight thousand miles in diameter, which is almost a negligible dimension in the great vastness of space.... Spaceship Earth was so extraordinarily well invented and designed that to our knowledge humans have been on board it for two million years not even knowing that they were on board a ship.

Pollution is nothing but the resources we are not harvesting. We allow them to disperse because we've been ignorant of their value.

One can study a caterpillar forever and never be able to predict a butterfly.

A fool with a tool still remains a fool.

Ninety-nine per cent of who you are is invisible and untouchable.

Everything we see is inside our own heads.

The future is a choice between Utopia and oblivion.