I have been listening to a podcast from CBC Radio called Ideas. They did a series of interviews with scientists and philosophers called “How To Think About Science”. It’s a fantastic program that I recommend everyone listen to. The episode with James Lovelock is rather sobering and if you don’t have time to listen to all of the program, listen it. James Lovelock is the man that created the concept of Gaia and is also responsible for tracking CFCs and linking them to the depletion of the ozone layer.