Build huge Algea production plants in the deserts, turn the sun light and CO2 into Algea, process that into oil and you get to keep making all of those things, you get to keep the oil infrastructure which is pretty well built around the world and its CO2 neutral, it sucks it in and puts out the same...
You don't quite fathom the scope of our wants and needs as a species, do you?
It will not be solved by the slow process of photosynthesis.