No positive feedback tends to catastrophically run away. Feedback with control elements can oscillate uncontrollably. For your comment to ring true it would mean that some control mechanism is present, I don't believe that to be the case unless you think humanity is that control element, i.e. drastically reduce our CO2 output at the top of the cycle and then increase it again at the bottom of the cycle.

I feel there is another source to our earth's temperature: https://en.wikipedia.org/wiki/Solar_cycle#/media/File:Carbon...