I've posted what actually drives global warming and cooling before. It's sun spots that cause global warming, and the lack of them that cause global cooling. The Little Ice Age corresponds to the Maunder Minimum, which had minimal sun spots.
This is the mechanism. Sun spots throw off charged particles which charge up the Van Allen Radiation Belts. The charged belts reduce the number of cosmic rays that hit the atmosphere, so there are fewer condensation centers for water vapor to condense on and cause clouds. Thus, less sunlight is reflected and more radiation hits the earth, and the temperature rises.
When there are fewer sun spots, the radiation belts are less ionized, and more cosmic rays get through, so there are more condensation centers and more clouds form. Thus, more sun light is reflected into space, and less hits the earth, so the temperature reduces.
CO2 concentration in the atmosphere is a result of temperature change, not a cause. If you look at a plot of temperature vs. CO2 concentration, you will see the CO2 concentration follow, not lead, the earth's temperature.
You can check this at home. Let an unopened can of soda sit on the counter until it assumes room temperature, and other unopened can sit in the refrigerator until it is the refrigerator's temperature. Then open each at the same time. Guaranteed the soda on the counter will go flat first, as the higher the temperature, the faster CO2 outgasses from a liquid.
Also, NASA satellite data says the earth's temperature hasn't risen in at least the last ten years, despite the rise in CO2 concentration levels. That alone gives lie to the contention that CO2 causes global warming.
Global warming is a hoax, concocted by the Soviet Union to try to destroy Western economies.
IBTL