> > Doing it in 50y would be very fast. OTOH since that would have to involve
> > essentially unknown mechanisms, why not invoke other unknowns to make it
> > faster?
Let me give you an example of a potential good reason why it cannot
happen, say a large fraction of the Greenland ice sheet sits between
mountains, then that fraction cannot slide into the sea, as it would
have to overcome a hill first so to say. Very straightforward, absent
the green men James mentions it's pretty hard to see much movement.
But given a lubricated surface and an incline towards the sea, what's
the obvious limiting factor keeping speed down? Is this merely argued
based on analogy with observed glacier movement (which mightn't be all
that analogous, cubic kilometers of water below 2 km of ice might
quite considerably lead to very different speeds than what's observed
with alpine or antarctic glaciers)?
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