solar activity affecting global warming
By solar activity I assume that you are thinking of the solar wind. The solar wind is deflected from all but the outer edge of the atmosphere by the earth's magnetic field. The sun has not changed its heat and wind production beyond minor variations over its sunspot cycle. Solar ultra-violet radiation is variable but the ozone layer protects us from that problem; except at the poles (you can get one hell of a sunburn there). The danger is the possibility of the magnetic pole shift. Evidence of a magnetic pole shift is accumulateting. The South Atlantic Anomaly AAA, is possible north pole below the equator, is growing; slowly but growing.
There is no controversy about global warming scientifically. The only controversy is political. Politics and science don't mix.