Michael Tobis wrote:
> For very large perturbations it is a tedious and complex calculation,
> but for relatively small perturbations a linear approximation
> suffices.
For CO2, it is of course logarithmic (to a close approximation) but AIUI
CH4 and N2O are both in the linear range.
I agree with both mt and gerhaus that in detail it is more complicated
than merely adding up separate components (even when accounting for the
logarithmic effect of CO2). I was just pointing out what I saw as the
over-riding misunderstanding in Nils' original calculation, a failure to
account for the pre-industrial level of these other trace gases.
James
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