Is there not a commercial market for CO2? Beer, soft drinks, baking, etc.
Yes (for soft drinks anyway. CO2 arises during the fermentation process that occurs during beer production and dough rising) but not enough demand to match the production of CO2 by power plants and vehicle emissions. Plus there is a purity issue. CO2 in the capture BS could contain all kinds of impurities. CO2 for beverage use must be relatively pure or it will affect the flavor of the final product.