A billion could live off the earth; 6 billion living as we do is far too many, and you run out of planet in no time.

Civilization in its present form hasn't got long.

I wouldn't be against them (large wind turbines) if they actually worked.

The climate is doing its usual tricks. There's nothing much really happening yet. We were supposed to be halfway toward a frying world now.

There is little evidence that our individual intelligence has improved through recorded history.

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

Science always uses metaphor.