BBC interviews Dr. James Hansen

Scientist James Hansen has devoted his life to researching climate change.

Over the past 30 years he has repeatedly clashed with American administrations over the action needed to address the problem.

Now, as director of the Goddard Institute for Space Studies at NASA, he still feels his message is the most important of our time.
“We have now reached a point where if we don’t get on a different course very soon, the planet is in big trouble.”

And he says he feels driven to tackle climate change not just as a scientist and public servant but as a citizen and grandparent.

BBC (audio)