At the height of the last Ice Age huge ice sheets covered the northern continents. (pik-potsdam.de)
The results of such a new ice age would be catastrophic to humans and other life on Earth, including the southward advance of huge ice sheets in the Northern Hemisphere. (carlineconomics.com)
The basic reason for this is that there are no proxy data available in the areas which were covered by huge ice sheets back then but which are now bare (particularly North America and Scandinavia), and it is these regions which exhibit the largest anomalies for the LGM. (julesandjames.blogspot.ru)