Read here. Scientists have confirmed that a reduction in sulfate aerosols, 'global brightening', during 1980's and 90's allowed more solar energy to reach the surface instead of being reflected back into space. Voilà, global warming increased. Since the 90's, aerosols have stabilized, CO2 emissions have increased, and global temperatures have barely budged, even with some slight cooling. Ergo, solar radiation and diminished aerosols combined to increase majority of warming, not CO2. Climate models were, and are, wrong because they do not properly account for the aerosol impact.