A 10% chance of 7 m sea level rise by 2100 would matter a great deal. A
0.00001% chance would matter a great deal less. We'd then be in similar
probability territory as for a meteorite strike similar to the one that
got the dinosaurs, and clearly we aren't doing very much about that
particular danger given its low likelihood.
And a 10% change of 7 m sea level rise by 2020, gosh, you'd start me
wondering whether we should outlaw cars.
My understanding is that abrupt disintegration is impossible and we
therefore can't get 7 m by 2020, and 7 m by 2100 would require huge
amounts of coal to be burnt after 2050 and still be at considerably
less than 1% likelihood.
Considering the large impact on policy, surely somebody must have
looked at this question in some detail?
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