To be clear, "peak" refers to the maximum output of CO2; it does not mean that CO2 levels will begin falling in the atmosphere, merely that the rate at which we

To be clear, "peak" refers to the maximum output of CO2; it does not mean that CO2 levels will begin falling in the atmosphere, merely that the rate at which we add it to the atmosphere will begin to trend downwards instead of increasing (as it always has since the dawn of the industrial age). "Net zero" is when no more CO2 is added to the atmosphere and as far as I can tell is essentially science fiction at this point. Decreasing ppms of CO2 is beyond that even. As I said, this is all rather hard to take when considered seriously which is probably one of the reasons for denial. Probably the only near-term effort that can buy time is increasing the reflectivity of the atmosphere to counteract the greenhouse effect; it does seem technically feasible and economical, but is pretty half-assed and has problems of its own - principally a termination shock if it is ever discontinued.