I think he has an interesting argument:
1) The ice sheets are so far out of equilibrium that an exponential
increase in their net decay is a reasonable approximation.
2) The doubling time for the rate is about a decade.
I suspect point 1 fails to hold once we get into significant fractions
of a meter per decade, and I have no idea how he calibrated point 2,
but I think both points are quite plausible and worth discussing.
I agree that the "almost inconceivable" is disturbingly excessive.
mt
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