well it's a possibility, saturated growing environments, but more than that carbon is useful, sometimes the way it is used is highly polluting, like refining silicon surely we can find a way to use the gas instead of the raw element, or as an additive to steel. the steel industry was revolutionised by oxygen lancing why not carbon dioxide lancing. We are too set in our thought patterns, looking for incremental solutions, bound up in a science which is actually repeating what we have already done. If we can make ships out of steel we can make ships out of carbon and then......................