I was actually quite impressed when I read James Lovelock's Gaia a few years ago. Forget the New Age stuff you may have heard, or assumed, about Gaia as a 'Mother Goddess'. His was a perfectly sensible theory about the nature of an ecosphere (and, incidentally, I think he is spot on about detecting life on other planets - just look for entropy reduction and the signs for this in an 'unsustainable' atmosphere).
Here he is being interviewed by the BBC - with some sobering things to say about climate change and our response to it. And here is a link to the whole interview.
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