Consider - we've been digging up ancient, sequestered carbon and putting it in the atmosphere on a mass industrial scale for hundreds of years. I don't think th

Consider - we've been digging up ancient, sequestered carbon and putting it in the atmosphere on a mass industrial scale for hundreds of years. I don't think that anything we can do within the confines of a closed loop system is going to remotely compare with that. Or, to put it another way - we've been treating the atmosphere as a sink. But if we stop digging up carbon, we'll still need carbon, and it will become a source instead. By buffering that resource into fuel stocks and plastics and everything else we use carbon for, the only direction CO2 levels can go is down.