I recall reading somewhere that a study was done which showed that increased CO2 levels came about AFTER a rise in global temperature throughout the Earth’s history. Thus, CO2 levels increase as a result of increased temperature, not the other way around. I’ll have to find that study again.
In any case, increased CO2 levels are encouraging plant growth in the Sahara desert, shrinking the desert, but making more fertile and farmable land, and more land in which to live on.