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There have indeed been numerous glacial cycles on the earth for several million years. It has been noticed that they don't always follow the pattern of changes of earths orbit around the sun. However, when one considers the impact of changing atmospheric CO2 levels, then the pattern makes sense. That is that part of the climate change is from the changes in the earths orbit and part from atmospheric CO2 levels.

Currently, the earths orbit is favoring an increase in glaciers of the Northern Hemisphere. However, because of rising CO2 levels, this isn't happening.

Hundreds of millions of years ago, during the Jurassic period, CO2 levels were several times higher than they are now, and there were no permanent ice caps at the poles. The earths climate was much warmer even though the sun was no warmer then than now.
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