> Turning CO2 from the air into useful products like fuels and building materials You mean something like DME synthesis from CO2 and H2? Isn't atmospheric CO2

> Turning CO2 from the air into useful products like fuels and building materials You mean something like DME synthesis from CO2 and H2? Isn't atmospheric CO2 capture sort of expensive at 400 ppm? Obe would obtain one kilogram of CO2 from 2500 kgs of air. Turning atmospheric carbon to building materials is already being done with plant based fiber mixtures such as hempcrete or fiber cement.