Lucy in the Sky with Diamonds

Dale Vince, the owner of Ecotricity, claims to have created a process in Stroud, that will make diamonds from atmospheric carbon dioxide (https://www.theguardian.com/environment/2020/oct/30/ecotricity-founder-to-grow-diamonds-made-entirely-from-the-sky). It is, of course, going to be the case that the diamonds, if made, will be of industrial (they are used in cutting and other processes) rather than gemstone quality. Vince, a green energy multi-millionaire, points out that an added bonus of this 'sky mining' is that it will remove some of the climate-changing greenhouse gas from the atmosphere. This will be, however, only a tiny proportion of the amount we need to eliminate. We need more than a sky miner to solve our problems.