Well said. If anything, the geologic record of Earth's history having wild swings between different climates, and not gradual, shouldn't suggest that it's a "ro

Well said. If anything, the geologic record of Earth's history having wild swings between different climates, and not gradual, shouldn't suggest that it's a "robust system", but rather a fragile, sensitive system that could get kicked into a very different equilibrium under unknown circumstances. We are currently undertaking a massive experiment in altering the composition of the atmosphere and there is NO indication that that will be good.