Immigration is one of the leading contributors to population growth.

Back in 1980, whale watching surpassed whaling as an industry. Now it's worth about four times as much. Whale watching provides far, far more jobs to people than whaling ever did. Whale watching has become an ally in the fight to end whaling.

What we need now is heroes - millions of them. Sentiment without action is the ruin of the soul.

We live in a media culture and whoever controls and influences and uses media the best has the power for change.

They [Greenpeace] forgot their original purpose and turned into a big, rich bureaucracy, more interested in fund-raising than in saving lives, so I got fed up and quit... they're a bunch of wimps.

We have intelligent species on our planet that we are not even trying to communicate with.

We need to radically and intelligently reduce human populations to fewer than one billion. We need to eliminate nationalism and tribalism and become Earthlings. And as Earthlings, we need to recognize that all the other species that live on this planet are also fellow citizens and also Earthlings. This is a planet of incredible diversity of life-forms; it is not a planet of one species as many of us believe.