The grey band in the chart is the Vostok ice core time period.. The time in this chart passes from right to left, the left being present day. The chart show cyclic variations of up to 10 degrees. The question is does and ice cover causeCO2 to change or does CO2 cause the temperature to change. The climate crowd believes the latter. This chart shows the time lag resulting in temperature drop prior to a drop in CO2.
Some scientists speculate that variations in the earth's orbit and axial tilt lead to changes in solar radiation affects and lead to time period of warming and cooling. Some solar events lead to melting of permafrost as a source for CO2.
Imagine that...the sun plays a major role in the earth's temperature cycles!
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