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.

The tragedy is that there is so much more incentive - money - to destroy the ecology than there is to preserve it.

You cannot commit an act of violence against a non-sentient object, only against a living thing.

There's nothing wrong with being a terrorist, as long as you win. Then you write history.

We should not be living in human communities that enclose tiny preserved ecosystems within them. Human communities should be maintained in small population enclaves within linked wilderness ecosystems. No human community should be larger than 20,000 people and separated from other communities by wilderness areas. Communication systems can link the communities.

Intelligence is the ability of a species to live in harmony with its environment.

In other words, people should be placed in parks within ecosystems instead of parks placed in human communities. We need vast areas of the planet where humans do not live at all and where other species are free to evolve without human interference. We need to radically and intelligently reduce human populations to fewer than one billion.