If you've had some calculus, you may remember that some infinite
series converge and some don't. (It's really not a series in this
case but it has some of the same flavor.)
Conceptually if each boost around the cycle is smaller than the one
before it, it is possible to have a finite total boost. The
configuration of a planet such as ours, with a stable ocean, is such
that the runaway doesn't happen. The runaway case probably did happen
exactly as you describe on Venus; the difference is that the solar
constant there is higher so it works out differently, so the ocean
boils, the temperature stays very high, and life never arises on that
world to ask such subtle questions.
mt
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