Rubbish CO2 levels are directly related to human emissions, plants have not prevented this increase.
https://www.climate.gov/media/12990
And plants will also begin to absorb less CO2 as the planet warms
https://news.climate.columbia.edu/2022/01/27/how-climate-change-will-affect-plants/Elevated levels of CO2 from climate change may enable plants to benefit from the carbon fertilization effect and use less water to grow, but it’s not all good news for plants. It’s more complicated than that, because climate change is also impacting other factors critical to plants’ growth, such as nutrients, temperature, and water.
