I'm highly recommending The Green Interview hosted by Silver Don Cameron.
It has probably the best collection of interviews with environmentalist anywhere. Mowat, Goodall, Lovelock, Watson, etc and so on.
Don is an amazing xcellent interviewer who does not shy from unplanted truths. He does ask hard questions. Pleasantly, but the effectively.
http://www.thegreeninterview.com/home
One week free then a small donation or pay per view, very reasonable and should be supported.
I had an access issue and Don personally reaponded and followed up.