Here is an image: -
It attempts to demonstrate the extent to which global emissions
contraction needs to be accelerated if a reference path for future
concentrations is to be adhered to in the light of the failure of
natural sinks. The standard assumption has been that the airborne
fraction of emissions is constant [CAF] at 50% of emissions. This is
no longer true. This image shows the extent to which contraction [and
inevitably convergence] needs to accelerated to keep constant with a
predefined concentration curve.
These images show the predicament the other way around; i.e. where
reference paths for contraction are adhered to with the
concentrations accelerating higher as a result of sink-failure.
The breakdown of CAF is already documented by Hansen and others way
ahead of the IPCC.
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