It is rare that we can have an experiment on global warming but this seems to be what the sun is setting up for us over the next few years.
A sharp drop in solar activity could soon tell us how much mankind and the Sun are responsible for warming the planet

This has been a battle area for some time though I think there will still be people believing CO2 is not the main factor even if there is no significant cooling. I accept that the current models do not think this drop in solar activity will make much difference to the global warming trend. This also means that I do not think there is time to wait for the effects of low sun restlessness to be verified before we act on moving away from CO2 producing fuels as our main energy source.