I have a feeling that climate change may be an issue as severe as a war. It may be necessary to put democracy on hold for a while.

Those who fail to see that population growth and climate change are two sides of the same coin are either ignorant or hiding from the truth. These two huge environmental problems are inseparable and to discuss one while ignoring the other is irrational.

I'm a scientist, not a theologian. I don't know if there is a God or not. Religion requires certainty.

We live at a time when emotions and feelings count more than truth, and there is a vast ignorance of science

The big threat to the planet is people: there are too many, doing too well economically and burning too much oil.

Climate change now represents so urgent a threat to mankind that the only way to deal with it is by suspending democracy.

The inertia of humans is so huge that you can't really do anything meaningful.