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What conclusion can be drawn from the relative increases in temperature and
CO2? One implication might be that, because the relative CO2 rise is much
larger, therefore the CO2 is not likely to be the cause of the temperature
rise.
But, of course, that logic is faulty. Even if the relationship were as
simple as T = T_0 + k *(CO2 conc), proper choices of T_0 and k could mean
that the temperature rise is *entirely* due to the CO2, regardless of what
the relative increases are.
The relative increases are an interesting fact, but in the absence of other
information, I don't see how that fact contributes to thinking critically
about global warming. I therefore wasn't clear why you felt it "should
always be pointed out".
P.S. interesting that the CO2 concentration shown in the http site you
mention shows an annual cycle. Does anyone know why this is? Possibly
aphelion and perihelion?