[ChessExpert]

Nice graph. In this span of time, sunspots, temperature and CO2 appear to be correlated. Obviously, sunspots are not an effect of anything taking place on earth. Sunspots seem a plausible cause of changing temperatures. Would changing temperatures have an impact on CO2?

[palmer]

Would changing temperatures have an impact on CO2?

Yes, see my post 130, but the effect is a matter of debate. Also note that my graph is created by bandpass filtering the data, a legitimate time series technique (just like the PCA that creates the hockey stick).