Read here. Basic common sense suggests solar influences are driving all climate change instead of a minuscule trace gas such as CO2. In a National Science Foundation (NSF) funded peer-reviewed study of Chinese lake sediment cores, researchers find climate change cycles strongly associated with solar output oscillations.
"The authors find “The carbonate percentage and ostracode abundance show a consistent pattern with ~200 year moisture oscillations during the last 1000 years.” The variations appear to be related to periodicities of solar output – Zhao et al. conclude “Higher solar output corresponds to a stronger monsoon, which intensifies the uplift of air mass on the high Tibetan Plateau and strengthens the subsidence of air mass over the QB. The reverse is true during the period of lower solar output. Thus, high solar activity is correlated with dry climate in QB and increased precipitation in monsoonal areas.”.....As was the case in the first article, the 200 year quasi “cycle” is again linked to a similar cycle in solar activity. Zhao et al. speculate that “The ~200-yr time spacing between wet and dry climate periods indicated by the A/C ratio variations suggests a possible solar forcing of effective moisture changes in the region.” The authors also note that the basin was especially dry “around AD 1600 during the first few centuries of the Little Ice Age”. So much for any argument that the Little Ice Age was somehow confined to Europe....."