The cumulative impact of industrial scale human footprint cannot be undone in a hurry even if we were to commit economic suicide and return to the stone age. The process is autoregressive (alas more Swiss glaciers will melt) and may hit tipping points (permafrost melting accelerating temperature increase etc) before it gets controlled (assuming we even get to do the "right" things").
This kind of slow but steady and determined (over many decades) turning of the entire Homo Titanic to avoid the worst environmental disruption and settle into a workable equilibrium is an unheard of challenge. This is not the kind of game people know how to play. We are in uncharted territory, economically, politically and morally.