“We are at the crossroads now: We either say: this thing is too big for us, this task cannot be done. [Then] we will be transformed by nature, because we will end up with a planet warming by 4, 5, 6 or even 12 degrees. It would be the end of the world as we know it, and I have all the evidence. Or we say: We’re doing the transformation ourselves.”
— Hans Joachim Schellnhuber, climate scientist, Postdam Institute.