That's Patrick Moore. His book, Confessions of a Greenpeace Dropout is really good. I'm not aware of a full documentary featuring him. But he, along with Judith Curry, did a really good job in this climate debate, as far as I remember:

https://youtu.be/pVXHaSqpsVg

Patrick Moore specific highlights from that debate:

https://www.youtube.com/watch?v=IjsolpOmvIo

That's Patrick Moore. His book, Confessions of a Greenpeace Dropout is really good. I'm not aware of a full documentary featuring him. But he, along with Judith Curry, did a really good job in this climate debate, as far as I remember: https://youtu.be/pVXHaSqpsVg