Ice Age (Sideways Earth)

The Great Ice Age was a period of as long as a millennium before the first records of human activity on the earth. It is known that there was activity, as cave drawings and tools have been found in the caves of modern day Asia that show that humans of some intellect lived in regions on the edge of the northern hemisphere's ice fields. In the southern hemisphere, though, there seems to have been no human presence until after the ice began to recede to resent day polar conditions.

Many scholars, presenting conflicting information, postulate several ice ages lasting tens of thousands of years each. The best evidence, however, seems to indicate a single, sudden Ice Age that began to end as soon as it began. The massive and sudden deposit of very cold snow melted as the global temperature climbed from an average of 42°F to the present day 55.4°F (with variations along the way up and down). Most of the warming happened in the first five hundred years after the original event.