Assuming (and I don't) that humans are responsible for ALL the annual increase in atmospheric CO2, that would be THREE parts per million. The USA is down to generating less than hale the human caused CO2, China is not the top at over 50%.
So, if we reduce out CO2 PRODUCTION 40% OVER THE NEXT 20 YEARS , that's less than 1 ppm per year. Or, something on the order of total 10 ppm by 2028. Or, no change in reality. That is, IF tghe current increase rate really is human related, and that remains not proved.
lower solar activity has resulted in lower temp.s here on the ground. What a shock, turn the thermostat down, the home cools off! SHOCKING
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Nothing we do will alter the 3,000,000 year old ice age we've been all these millenia.