There is, even today, a Flat Earth Society that meets every year to say the Earth is flat. The science about climate change is very clear. There really is no room for doubt at this point.

Climate change is for real. We have just a small window of opportunity and it is closing rather rapidly. There is not a moment to lose.

An extremely effective instrument would be to put a price on carbon. It is only through the market that you can get a large enough and rapid enough response [to climate change]

Nobody on this planet is going to be untouched by the impacts of climate change.

Stop worrying about the lousy science, and how me the money already.

Please eat less meat - meat is a very carbon-intensive commodity.

Climate change: It's here. If we don't react, war, pestilence and famine will follow close behind