Comment Re:Feedback loops (Score 2) 273
This is something where engineers know things that climate scientists apparently don't.
If the positive feedback was so strong, that the system was unstable (right half plane as it were) the earth would already be Venus. Doesn't stop climatologists talking out of the butts and proposing just such strong positive feed-backs.
TL;DR; Don't ask a climatologist a control systems question and expect a reasonable answer.
Real engineers know that reality is rarely a linear system represented only by poles and zeros. And they also know that complex systems can have multiple locally stable points, and that even stable systems may "ring" when perturbed with potentially catastrophic consequences.
Consider the humble electronic oscillator which most certainly has a right half plane zero, does its output rise over time until it blows up the universe (aka turns into Venus)? No it doesn't. And to describe the magnitude of the oscillation generally requires the nonlinear transistor model which includes things like the maximum output current of the transistor, it is not a simple linear model like the one you propose.
Earth is quite complex and while an engineer could model it as a control system it would be much more complex than the one you have proposed.
TL;DR Engineers are just as capable of being incorrect as climate scientists are.