Chemical reduction of CO2 is a very hard problem since it takes a lot of energy. There's an enormous amount of research in this area. Storing it costs money,

Chemical reduction of CO2 is a very hard problem since it takes a lot of energy. There's an enormous amount of research in this area. Storing it costs money, so most of the research focuses on turning the C into a useful product. https://en.wikipedia.org/wiki/Electrochemical_reduction_of_carbon_dioxide https://en.wikipedia.org/wiki/Electrochemical_reduction_of_c...