Just found this:
http://www.geolsoc.org.uk/gsl/geoscientist/geonews/page1186.html

"Recent observations suggest that major changes in parts of the ice
sheets are taking place over timescales of a few years to decades, not
thousands of years as traditionally believed" explains Jonathan Bamber
at the University of Bristol, who has recently published a paper with
colleagues examining the growing evidence that there is still much we
don't understand about ice sheets. "These changes were not predicted
by numerical models and the underlying causes are uncertain."


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