The fact is fossil fuel carbon will stay in the surface climate system for millennia.

The five-year mean global temperature has been flat for the last decade

It would be immoral to leave young people with a climate system spiraling out of control.

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.

...chief executives of large fossil fuel companies to [should] be put on trial for high crimes against humanity and nature; [Hansen] accusing them of actively spreading doubt about global warming in the same way that tobacco companies blurred the links between smoking and cancer.

I tend to be naive and gullible, I guess, but I try to believe that governments believe what they say.

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.