This is not a new objection, here it is almost 6 years ago:
http://www.realclimate.org/index.php/archives/2006/02/richard-lindzens-hol-testimony/
I suppose Lindzen may have responded to this objection, since it has
been around for a while, but I can't find his response.
This article implies that Lindzen thinks that a higher-than-expected
albedo forcing of the ice sheets could be the source of the extra
forcing required. Or is it a straw man who thinks that? Not sure.
Also the article implies that Lindzen (or a straw man) thinks it was
not so cold as most climatologists think it was during the glacials.
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