Tipping

I was once out walking with a friend, I think we were saving the world, we were talking about the US running amok, after the fall of the Soviets, my friend said, (realize we were technical people ), “without negative feedback stability is lost”, he was projecting from the world of electronics to world at large. 
The correct percentage of feedback, keeps analogue circuits stable, no violent swings ending in the avalanche/tipping point. 
The world climate to me seems like a massive analogue device, so when I read Prof. James Lovelock, where wrote of: first the unstable swings in the climate followed by a sudden reseting to a new stable state, it made perfect sense to me. 
I had to write an algorithm in one of my programs, it went hunting for the knee and then tracked the change, to a new steady state, this was electronics, but it seems to fit with what I am reading here. 
I then had to back track to return to the original state, and of course there was hysteresis . 
To return to the original steady state one had to go past the force of the tipping point. 
At the knee you could control the state but once past by the merest fraction all control was lost, and no further change of force was needed, tip that was it. 
That is how I am reading this article regarding CO2. 
As for positive feedback, thats what turns amplifiers into oscillators, Antarctic ice into rock. (in the case of warming)  
 
Mike

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