There\’s rather a big snag, however. We are already well over that limit, at 387 ppm. Concentrations passed the 350 point in 1987, and international negotiations are bogged down over plans that would eventually stabilise them at 450ppm. So the world would not only have to cut emissions back far faster than anyone has thought possible, but would actually have to develop ways of taking the gas out of the atmosphere – the biggest ask in history.
No, it ain\’t the biggest ask in history nor anything like it. We know exactly how to take CO2 from the atmosphere.
The half life of CO2 in the atmopshere is 100 years (think I\’ve got that right) which means that if we stop emitting then all we have to do is wait and the level will naturally fall.