I guess you had better get used to the idea of an ice free planet. It is not even remotely possible to get CO2 emissions down to ZERO - [Really?? ZERO - not stabilized, not substantially reduced, but ZERO?? Pfffft] in any timeframe, much les "very very rapidly".
Also, since I have seen the evidence that CO2 levels have been higher in the distant past, the notion of a "runaway self reinforcing effect" is ludicrous. If that were even possible it would have already happened sometime in the last 4 BILLION years and would never have reversed.
Stop self aggrandizing - you are not vital, are not alive in the pivotal moment of Earth's history - all this vitriol is simply to feed your own ego, and has nothing to do with hard science.
I'll still be around in 20 years, so will you, and you will find the world is still spinning, same as it always has, same as it always will. The sky is not falling Chicken Little.