re: Your occasional reminder that global warming is real,

quote:

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With CO2 causing warming, resulting in further CO2 release from oceanic reservoirs, in turn further driving atmospheric concentration, causing further warming . . . what's the "off-switch"?
You just said you understood the difference between positive feedback and runaway feedback. Yet you keep asking this question which applies only to runaway feedback. Can you briefly explain what you think the difference is?

Hint: 0 < X < 1

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Sure.
We've discussed this in the past.

Cutting to the chase relative to AGW, positive feedback results in a nonlinear CO2=>Temp relationship. i.e., With increases of atmospheric CO2, there is a declination in its collective greenhouse effect.

The point being, PF would not eliminate forcing contribution at any concentration, nor of course would it reverse the effect. In other words, PF has nothing to do with "off-switch" or cooling.

With an implied progressive declination of effect, we've also previously discussed PF as undercutting of AGW alarmism.

Positive feedback is supportive of CO2 tracking temp in ice core data as well. It appears suggestive of prehistoric temps leading to atmospheric CO2 flux rather than the opposite.