Why Have Ice Sheets Grown Larger Since 0.9 Myr Ago?
			q Explanation 2: Ice Slipping Effect (nothing to do with climate changes)      During earlier glaciations (2.75 – 0.9 Myr ago), ice sheets may have been thin because they slid on water saturated soil toward lower elevations and warmer temperatures.       During later glaciations (beginning from 0.9 Myr ago), after ice sheets stripped off most of the underlying soil, their central regions could grow higher because they no longer slid.