The solution in the 2017 IPCC report was stop putting CO2 in the atmosphere, CO2 capture and refreeze the poles (throwing up particles to deflect sunlight). CO2 capture alone is not enough.

The reason to continue moving to renewable is that they are cheaper and less resource intensive. Lots of logistics involved in fossil fuel discovery extraction, refining, transport, among other things.

Even if we started today, we have to deal with destabilized climate. More disasters. Etc. Eventually, we will have refugee crisis. A proposal is to start building cities now (or soonish) in the north to make the process easier.

Not sure we are dealing with a doomsday this century, but we will be dealing with a mess from wilder and wilder weather.