Recent NASA research suggests that warming trends in the Arctic during the past 40 years aren’t due to CO2 emission increases. Instead, the spike in Arctic temperatures during the past forty years appears to be due to reduced aerosol particulates, specifically to reduced sulfates in the atmosphere. The sulfate reduction is believed to be the result of improved emission standards that were implemented to, ironically, improve the environment through reductions in acid rain. Aerosol sulfates reflect heat back into space, reducing temperatures, whereas different aerosols, termed “black carbon aerosols” and produced largely by burning coal, have the opposite effect: holding heat in.
To me, this doesn’t really prove anything other than the climate is a whole lot more complex than “A+B = C, therefore C-B = A”. Some of the ideas for “correcting” the CO2 imbalance could tip the climate in exactly the opposite way to what is intended. Hopefully we can figure out enough during the next couple of decades to prevent a knee-jerk change proposed by some enviro-evangelist causes a disaster beyond any that might have occurred “naturally”.