Well, Lovelock knows better than anyone on this forum what science consists of. And what a scientist must do… He put forward his Gaia hypothesis in 1969. It still stands nearly 40 years later. It has not been disproven to the satisfaction of the scientific community. It sheds light on much natural phenomena. And continues to shed new light.
He first started warning about planetary warming from CO2 in 1979. It took a long time for him to be taken seriously. Now, his scientific predictions point to chain reactions occurring with respect to the level of CO2 that is currently in the atmosphere. ie. primarily the ocean releases a huge amount of CO2 at a certain temperature. And he cannot see how this can be mitigated at this point of time.
Then, in his scientific career, he has studied rocks, and what could be read about the distant past as regards the composition of the atmosphere, and the correlating conditions of life, from these rocks. His ‘ages of Gaia’ gives a fascinating history of the eath’s evolution from it’s birth to present day based on this work with rocks.
Now, in only one period of the earth, prior to our times, did he find that CO2 levels were as high as they are today. (in fact they were about three times higher). From his study he found that also at this point in time, the earth was so hot that life was only feasible around the poles. It was too hot for life elsewhere.
So, in essence, all of Lovelock’s life of research points to the facts that (a) we are heading towards a tipping point where the ocean will release vast quantities of CO2, and (b) there has only been one period in the earths history where CO2 levels were as high as they are now, and this correlated to a time when the earth was too hot for life apart from the arctic regions.
Now, maybe many people think that his conclusions sound ‘unscientific’, or extrordinary, or whatever. But the fact is that he has spent his life in research, building up a big picture of this, and all of those researches suppport those conclusions.
And if you look back through scientific history, you’ll note that science is at it’s best when it reveals things that seem incredible to the masses living at that time. From what I’ve read of Lovelock, he seems to be carved out of the same stuff as a Galileo. That’s just me though. And I hope he’s wrong of course (though my own researches seem to point to this being just wishful thinking). And he hopes he’s wrong too, I know.