Having regard to the demographic increase — we know that the world population is several times more than what it was in 1900 — and to technological means, vehicles and our habits and so on, and if we consider that there was already a climate change 100 years ago, to what extent should our CO2 emissions be reduced in order to achieve neutral warming or even a cooling of the Earth?
On November 7th, 2006. See this statement in context.