CLIMATE CHANGE The Last 400,000 Years

Source Arendal UNEP

Over the last million years the earth's temperature has be going through wide swings in temperature with a cycle length of about 100,000 years.

The above chart records these swings using ice core data for the last 400,000 years. Temperature have ranged as much as 10 degrees C. At same time CO2 content has tripled from their bottom low in the ice age to the intermediate warm
peaks.

It is agreed that these swings are not man made. But are probably from two sources:
----- Variations in the Sun's nuclear furnace and Sunspots.
----- Variation in the orbit of the Earth relative to the Sun where the variables are Tilt, Precession, and eccentricity.