There's no reason that feedbacks must be positive in principle. Regardless, though, as the earth system wanders farther from its most recent stable state (the H

There's no reason that feedbacks must be positive in principle. Regardless, though, as the earth system wanders farther from its most recent stable state (the Holocene equilibrium), its behavior is likely to continue to become more chaotic and difficult to predict. That's not good for humans no matter whether it involves warming or cooling. To my knowledge the reinforcement mechanisms we are aware of do tend to be positive, though, hence the focus on warming.