The glaciers are not generally stable in interglacial periods. Melting ice from the last Ice Age is to be expected.
Same thing happened a thousand years ago as well, and probably happened faster then.
Cheers, Ben
"Career politicians are inherently untrustworthy; if it spends its life buzzing around the outhouse, it\ufffds probably a fly." - [link|http://www.nationalinterest.org/issues/58/Mead.html|Walter Mead]