@nerthos Neither point should need arguing. Even a toddler has enough scientific understanding to know that both are fairly irrefutable.
@nerthos What we know clearly is how strongly CO2 levels correlate to temperatures, we have very good long-term data on that. Combine that with the fact that we know fairly well how much of the CO2 in the air is our fault. I'd say the data is pretty well established as to how much of it is from humans.
So we dont really need to know much about predicting weather since we know our own contribution and therefore know anything beyond that is natural