Comment by chki

I think the argument is that if we stopped all our CO2 emissions right now we would comply with the 1.5 C target in 2050 but would "only" break it in 2100. Since stopping all our emissions is not even close to what's happening (actually CO2 emissions are rising right now) that's not a viable model. So we will probably need to recapture CO2 as well – or rather we will need to develop the necessary tech first.