There is no evidence of global warming due to CO2 buildup. As a matter of fact if the CO2 level which is now about 400 ppm is reduced below 170 ppm, all plant life and therefore all human life ceases.
TRUE! And prior to the industrial revolution the CO2 level wasn't much above that extinction level and had been trading downwards for eons. The culprit was living, but not humans. Coral and other marine life were sequestering CO2 from the air into rocks either when alive or when subsequently fossilized. Earth would have died but for Man coming along to recycle fossilized carbon back into the air and save the day!