Water vapor is also a greenhouse gas- more effective than CO2 (as is methane). Is it too much to think that the temperature increase ( from whatever cause) might increase the water vapor levels in the atmosphere, increasing the greenhouse heating, raising the temperature, and increasing the water vapor??

The ONLY cure for this cycle is to reduce the temperature ( NOT the CO2) by increased particulates. That would reduce the solar heating of the earth, and reduce the temperature.

Best way to do that is a major nuclear war.