Even on the timescale of decade or two, we could end up be very surprised on how the climate plays out and it might not be getting warmer like the   says. We don’t know what’s going to happen. All other things being equal – yes – more carbon dioxide means warmer, but all other things are never equal. We just don’t know. I think we are fooling ourselves to think that  control knob really influences climate on these decadal or even century time scales.