It's my impression that we are very close to uncorking the WAIS
already in the Amundsen embayment, and that a sustained 380 ppmv would
suffice. I indeed went as far as "little doubt" on the strength of the
likelihood that we are very unlikely to see 380 as the peak.
The exact threshholds are probably not knowable in advance, but it is
worth noting that these did fail entirely in the previous
interglacial, so we presumably started off quite close to that point.
mt
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