In the video, shot earlier this year for his TED Talk, James Hansen explains why he feels he must speak out at every opportunity about what he has found out about climate change. He starts off by posing the question: “What would you do, if you knew what I know?”
Hansen talks about his involvement in climate science over decades, and explains his understanding of the now overwhelming and clear evidence that climate change is happening.
He has said many times that he feels he has to try and make what he knows absolutely clear to as many people as possible, so in the future nobody can say he didn’t try as hard as he could to get the message across. He’s deeply concerned that the world is not yet doing enough to avert the disastrous climate outcome he can see ahead.
Image: snapshot from video