> CO2-eq is used to mean the equivalent CO2 concentration, holding other
> gases fixed at the pre-industrial level. So you have to subtract off the
> pre-ind level off CH4 and N2O from your sums. I think what you have
> effectively done is work out the CO2-equivalent if all other gases were
> zero.
So far so good, but:
Can we really just add up like that? I understand that for CO2
concentration the effect is logarithmic, presumably that's also the
case for other GHG's and then isn't there such a thing as overlap
between the absorption bands of different GHG's?
I don't really understand the basic physics of spectroscopy very well,
but from what I've read I thought it was a lot more complicated than
simple addition?
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