Uniformitarians’ Model for Ice Age Would’ve Caused Less Clouds by Colder Weather so Obviously Bogus Theory

If less solar radiation for colder weather was the cause of the Ice Age (as the uniformitarians blindly opine), then the skies would have been less cloudy not more cloudy, this obviously not the reason for thousands of vertical feet of snow to have accumulated on landmasses, so the question is what caused so much water to evaporate to form much more cloud-cover than we see today?