I have no doubt that this could be done, but the cost would simply be too great. Plant a tree, and capture the CO2 in wood instead of coal...it is much cheaper.
Although making coal out of CO2 would be too expensive, maybe they can just figure out a way to reduce the percentage of it in the air. It's interesting.
@Ken Anderson It's already being done by several small-scale pilot plants, one being a Canadian firm, "Carbon Engineering Corp." Their plan is to produce gasoline, jet-fuel, or heating oil using CO2 extracted from the atmosphere. See: https://en.wikipedia.org/wiki/Carbon_Engineering Also see: https://news.nationalgeographic.com...g-liquid-fuel-carbon-capture-neutral-science/ Regarding increasing CO2 atmospheric levels, I must agree with you on.