Apparently not. Saw a feature recently where an astrophysicist postulated that the long time variations of the earth's temperature correspond pretty neatly with the amount of some sort of radiation that hits the earth while we travel through space. Unfortunately i don't remember the details exactly but it made quite sense and certainly shows that the earth's climate is much more complex and depending on many more factors than we used to think.
He also said that this doesn't explain short time rises and falls of the earths temperature.