Michael,
I get the general idea of a tipping point, in short and in the extreme,
once ice sheets start breaking down, we may get to a new equilibrium,
where even pre-industrial carbon dioxide levels won't be enough to get
us back to the previous equilibrium.
Hansen writes that it is commonly assumed that ice sheet disintegration
will take millennia, and he thinks, though that is outside of his area
of expertise (he actually says that in the paper I linked in my reply
to Coby), it's probably only a few centuries.
To get from that to a decade by pointing to lags in energy
infrastructure is where I either misunderstand him, or think his
argument is very weak.
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