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And yet the Climate Science community continues to ignore the fairly profound implications of what the data actually shows.
Since the clout and reach of this blog has grown tremendously since 2014, the time seemed ripe to have another go.
A note on terminology: The glacial episodes both begin and end very rapidly.
Each responds in their own time to changing climate.
The absence of coupling may be explained by the different bio-geochemical pathways these gasses have in the biosphere – ocean – atmosphere system.
For background information on Vostok, readers are directed to that post.
One of the key observations I made was that at the inceptions of the last 4 glaciations, CO2 lagged temperature by several thousand years: The post has now had over 8000 reads and is probably one of the most read texts on this subject.
This falsifies the traditional narrative that d CO2 amplified weak orbital forcing effects.
It is quite clear from the data that CO2 follows temperature with highly variable time lags depending upon whether the climate is warming or cooling.
Time lags of a few hundred years can be explained by dating errors and calibrating the gas ages to the ice ages (see my earlier post).
This has caught the attention of the climate science community and for example Parrenin et al (2013)  revised the gas ages in Vostok over the time interval 10,000 to 22,000 years ago that spans the termination that preceded the Holocene interglacial where the established chronology already showed good alignment between CO2 and T (Figure 1).
At the termination, CO2 follows d T exactly, but at the inception CO2 does not follow temperature down for 14,218 years.
Full glacial conditions came into being without falling CO2 providing any of the climate forcing.
Figure 1 Temperature and CO2-co-variance in the Vostok ice core .