"Don Tabor" wrote:

"Instead of melting slowly, like a giant ice cube, ice in Greenland and
elsewhere seems capable of melting much more rapidly. Reports back from the
field are noticing disturbing trends in this regard."

The IPCC working group 1 Tech Summary mentioned those and rejected
them.

I cannot seem to find a document with that exact name. Can you provide a
link?

It is in the sea level rise section that the report gave the 20 degree
C requirement for melting the Antarctic Ice Sheets over millennia.

You really should read it.

I've read this:

_IPCC WGI Fourth Assessment Report_

p. 17

"Contraction of the Greenland ice sheet is projected to continue to contribute
to sea level rise after 2100. Current models suggest ice mass losses
increase with temperature more rapidly than gains due to precipitation and
that the surface mass balance becomes negative at a global average warming
(relative to pre-industrial values) in excess of 1.9 to 4.6°C. If a negative
surface mass balance were sustained for millennia, that would lead to
virtually complete elimination of the Greenland ice sheet and a resulting
contribution to sea level rise of about 7 m. The corresponding future
temperatures in Greenland are comparable to those inferred for the last
interglacial period 125,000 years ago, when paleoclimatic information suggests
reductions of polar land ice extent and 4 to 6 m of sea level rise."

--
Dan
C172RG at BFM