In 1960 CO2 was at 315 ppm. It is now at 390 ppm. Plants continue to become more efficient until the level reaches around 1000 ppm where any higher levels stop helping plant growth get better. At the current rate I figure 2500 is around the time that happens.By then fossils fuels will have either run out or replaced by something cheaper at the time.
Also important to know is the since 2016 or so the usa has had a negative carbon footprint.
india and china are fuelling greenhouse gases.