What does the Vostok ice core tell us?

Climate myths: Ice cores show CO2 increases lag behind temperature rises, DISPROVING the LINK to GLOBAL WARMING

In 1998, the collaborative ice-drilling project between Russia, the United States, and France at the Russian Vostok station in East Antarctica yielded the deepest ice core ever recovered, reaching a depth of 3,623 m

Ice cores are unique with their entrapped air inclusions enabling direct records of past changes in atmospheric trace-gas composition

the Climate Science community continues to ignore the fairly profound implications of what the VOSTOK ICE CORE data actually shows.

The key issue appears to be a LAG between temperature changes and CO2/CH4 changes

variations in CO2 and CH4 are both caused by global temperature change and freeze thaw cycles at high latitudes.

These natural geochemical cycles makes it inevitable that CO2 and CH4 will correlate with temperature.

It is therefore TOTALLY INVALID to use this relationship as evidence for CO2 forcing of climate,

especially since during the onset of glaciations, there is NO correlation AT ALL.

It is certainly NOT the case that CO2 is the main driver of the glacial cycles.

The TRIGGER for the glacial cycles is probably orbital variations,

in particular large changes in solar insolation at high northern latitudes.

However, the net change in solar insolation (globally) is small, so it cannot – by itself – produce much in the way of warming/cooling.