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ppmv = part per million volume; ppbv = part per
billion volume
1 The growth rates of CO2,
CH4, and N2O are averaged
over the decade beginning in 1984.
2 Estimated from 1992-1993 data.
3 No single lifetime for CO2
can be defined because of the different rates of
uptake by different processes.
4 Defined as an adjustment time which
takes into account the indirect effects of methane
on its own lifetime.
Source: IPCC, 1995
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