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Temp+CO2 1500 year smoothing

Notes:

Once smoothing is applied, the relative variability between temperature and CO2 measurements becomes better matched.

An important feature in the data, is that prior interglacial periods had temperatures 3C warmer than today with 20% lower CO2 levels. Furthermore, these higher temperatures represent averages integrated across thousands of years.

The data also indicates that the recent spike in CO2 concentrations has had no measurable effect on the average temperatures.

The current interglacial period has been unusually long and stable, which is related to being relatively cool. The last time this occurred was about 500K years ago, which is not in the Vostok record, but can be seen in the DomeC record. The DomeC interglacial period near the end of the record (750K years) is the best match to the current one.