It's the earth

The earth itself appears to play a key role in Global warming.

The Russian scientist, Milankovitch studied three aspects of the earths relationship to the sun. These are referred to as eccentricity, obliquity and precession.


In terms of eccentricity, it seems that there is a key oscillation that occurs every 100,000 years. These oscillations appear to correspond to the ice ages that the earth has experienced. The orbit of the earth is of course is elliptical and in mathematics this oscillation is referred to as eccentricity.

Another factor is the variation of the earth's obliquity or tilt of the earth's axis every 41,000 years. This tilt apparently varies between 22° and 24.5°.

Precession involves a change in the direction of earth axis with respect to various fixed stars.This has a period of roughly 26,000 years.