The best place on Earth to measure the greenhouse gas warming effect from CO2 is Antarctica.
Antarctica’s average winter temperature is -60 degrees Celsius.
Antarctica air is very dry, so there is almost no greenhouse effect there from water vapor.
CO2 is the only significant greenhouse gas over Antarctica.
Evidence of CO2-caused greenhouse warming would be a narrower spread between day time peak and night time low temperatures in Antarctica.
There's no evidence of that in actual measurements.
Night time warming is the primary warming caused by CO2.
That fact is obscured by compiling only the average temperature of a whole day.
Weather satellite measurements show no Antarctica warming over the past 36 years, as CO2 rose from 330 to 404 ppm.
Ground measurements show no South Pole warming over the past 59 years, as CO2 increased from 315 to 404 ppm.
CO2 increasing almost 30% had no impact on Antarctica temperatures -- a cold, dry region most likely to be affected by CO2.
The North Pole is also cold and dry, but the floating ice there is affected by changes of ocean currents, and dark soot from burning coal in the northern hemisphere, making it hard to judge what effect CO2 might have.
Antarctica ice core studies of the past 800,000 years show CO2 peaks FOLLOWED temperature peaks by 500 to 1,500 years -- "followed" means rising CO2 did not cause Antarctica warming.
Oceans warming, from natural causes, outgas dissolved CO2 into the atmosphere.
That's why CO2 peaks lag temperature peaks -- it takes time to warm the oceans, and they release gradually CO2 as they warm.