No it wouldn't because renewable energy and nuclear power exist. Our quality of life might drop by 50% but there is no reason we can't maintain our industrial civilization to some degree.

Intermittency beyond a day isn't even a problem because wind and solar basically cancel each others seasonal shortages out. There will be a few days in the year during which output drops by 60% but is that the end of the world for us? It absolutely isn't.

CO2 pollution is mostly about short sighted greed than about maintaining our advanced civilization.