What would you say if you discovered CO2 is not a driver of climate change?

Latest research indicates that the real drivers of climate change is the suns output and the earth's magnetic field both of which are in constant flux. The sun's out put seems obvious but the earth's magnetosphere determines how much cosmic rays reach the lower atmosphere. The more cosmic rays in the atmosphere the more cloud cover. The more clowd cover the cooler the climate. CO2 has Zero impact on climate. Man generated CO2 has even less effect.