It's less hyperbolic than you might imagine. Water vapor is also a greenhouse gas. On a long timeline, I believe it is possible to follow a chain of CO2 increas

It's less hyperbolic than you might imagine. Water vapor is also a greenhouse gas. On a long timeline, I believe it is possible to follow a chain of CO2 increasing the temperature until we get uncontrolled CH4 emission that will then increase temperatures until we get into a positive feedback loop of increasing water vapor. I have read that this is likely how Venus became a hot dry ball.