I don't understand. This can't be right. If the water vapor increases 7% for a 1C rise, water vapor being a very potent greenhouse gas, that would make the temperature rise at least another 1C, which would bring 7% more water vapor, which would bring another 1C .... which is a runaway situation. If that was true, then it would have runaway long long ago. So something is wrong here, probably with my own assumptions. Can you correct them?

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Maybe it's not "at least another 1C". Maybe my ballpark belief about water vapor is off. Or maybe the water vapor increases less than 7%.