The Rise of Slime

They have done experiments to try to modify the process by adding iron, this promotes the growth of various plant types mainly single cell algae. They feast on CO2 and the suns energy. The effects have been good. The shortage of freely available iron seems to be a limiting factor. Look up seeding the oceans with iron.

Such tinkering could provide some temporary relief. In ancient times the earth had a mostly CO2 atmosphere, much like Venus today. With the evolution of botanical processes, much of the carbon was sequested into deep mineral deposits over periods of millions of years. The reduction of CO2 and the introduction of oxygen into the atmosphere permitted the evolution of animal life. Clever creatures that we are, we are working at the restoration of the CO2 component of the atmosphere. Look at the progress that we have made in only a couple of centuries!

Perhaps we are only half smart. From Wikipedia:

"The enormously CO₂-rich atmosphere (of Venus) generates a strong greenhouse effect that raises the surface temperature to over 400 °C (hot enough to melt lead!). This makes Venus' surface hotter than Mercury's, even though Venus is nearly twice as distant from the Sun and receives only 25% of the solar irradiance. Studies have suggested that several billion years ago Venus' atmosphere was much more like Earth's than it is now, and that there were probably substantial quantities of liquid water on the surface, but a runaway greenhouse effect was caused by the evaporation of that original water, which generated a critical level of greenhouse gases in its atmosphere.^[12] Venus is thus an extreme example of climate change, making it a useful tool in climate change studies."

But we continue a lively pplitical debate over whether atmospheric CO2 is a problem. No doubt that this is not our only problem, but the CO2 problem is real and it would be prudent to confront it at its source.

Long before we burn up we will suffocate. Above 14% CO2 is lethal.