DIFFERENCE BETWEEN ICE AGE AND ICE FREE PERIOD IS AROUND 5 DEGREES CELCIUS: Because of history we know that there have been times of Natural Climate Change, both colder and hotter spells. The Romans Empire went through a hot spell from 600 BC to 200 AD where the Saraha Desert and almost all of North Africa was wet and fertile and became dry and desolate. There was also a Medieval Warming from 900 to 1300 AD when Eric the Red Colonized Greenland. There was also a cold spell from 1300 to 1850 AD that killed off these colonies, farms, and many of it's people. These cannot be proven beyond a shade of a doubt because they happened so long ago but archeologists and known history claims these environmental changes to be certain.

Just recently, scientist have projected two different future possibilities that may occur on the earth. One is a break from Global Warming, possibly for the next 10-20 years. The second is the possible new Ice-Age because the sun's activity has not been to pick up again after the last solar cycle. If the sun's activity does not pick up the earth will begin to cool at a fast rate and the average temperature will drop below avarage and as stated below, an Ice-Free Age and an Ice Age is within a 5 degree difference which may not be hard to meet. The good news is that Global Warming should slow down so we have time to catch up. If it goes into a Ice Age period that brings up completely different concerns.