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.

We have embarked globally on a path of unsustainable development. Our lifestyles, the way we produce goods and services, are all part of a system that is completely unsustainable. I see solutions to climate change leading to a much larger philosophical shift in the way human society develops. We need a new matrix to define what human progress is.

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.

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

What is the difference between Lomborg's view of humanity and Hitler's? ...If you were to accept Lomborg's way of thinking, then maybe what Hitler did was the right thing.

The IPCC doesn't do any research itself. We only develop our assessments on the basis of peer-reviewed literature.

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