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(edit: but I almost forgot - it would be mindblowing if it turned out the Earth was somehow tuned to bring itself back to some average. The millions of different chemical combinations and seasonal variations all mediated by the ecosystem - which seems rather fragile but what if it was brutally rigid. I guess it's had a couple of billion years to gear itself up?)

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It basically already is tuned to maintain an average, just as a buffer solution can oppose changes in pH. It maintains a temperature level above what we'd otherwise expect, and our unnatural oxygen atmosphere.

If we do nothing, it is unlikely to run away, but it will take rather longer than a human timescale to put it back to a comfortable level, and there could be a lot of damage over the next century.

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