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.
I personally calculated that planting trees would be thousands of times more cost-effective than driving Tesla vehicles: https://news.ycombinator.com/item?id=19714034
Cutting down a fraction of industrial activity- which represents a fraction of human-made CO2 output, which is only about 5% of mother nature's CO2 output- seems a lot less efficient than improving upon mother nature's own carbon sequestration schemes. It's better to sequester potentially all of the CO2 in the atmosphere instead of targeting a fraction of a fraction of a fraction of atmospheric CO2
The answer has to be to apply technology. Cleaner energy generation and new (or old) methods to sequester CO2.