James Hansen

We are on the precipice of climate system tipping points beyond which there is no redemption.

Only in the last few years did the science crystallize, revealing the urgency - our planet really is in peril. If we do not change course soon, we will hand our children a situation that is out of their control.

Coal is the single greatest threat to civilization and all life on our planet.

Global warming isn't a prediction. It is happening.

I have been described as the grandfather of climate change. In fact, I am just a grandfather and I do not want my grandchildren to say that grandpa understood what was happening but didn't make it clear.