There aren't just bad people that commit genocide; we are all capable of it. It's our evolutionary history.

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

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

I suspect any worries about genetic engineering may be unnecessary. Genetic mutations have always happened naturally, anyway.

Geological change usually takes thousands of years to happen but we are seeing the climate changing not just in our lifetimes but also year by year.

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

China will soon emit more greenhouse gases than America, but its regime knows if it caps aspirations there will be a revolution.