[Rocky]

Shakun, et al, did not present the whole story. CO2 has apparently been rising for 7,000-8,000 years.

[Richard from IL]

If the data doesn’t support the theory, hide the data.

[SunTzuWu]

That's because CO2 levels trail temp changes. Warming causes CO2 rise not the other way around. It's called a trailing proxy. CO2 levels have been rising for the last 7K - 8K years because the Earth was coming out of the last ice age.

[agere_contra]

As a commentator pointed out: the Younger Dryas Stadial (a sharp ‘kink’ in temperature that happened some 10,000 years BC, or 12,000 BP) is clearly visible in the data.

The YDS is thought to have occurred as the North American Ice Sheets collapsed, causing a sharp reversal in the general warming trend after the end of the Ice Age 20,000 BP.

In essence the temperature goes up, then down, then up. The CO2 follows temperature as it goes up, but its reaction time lags temperature in a smeared response some 800 years long. So as temperature sharply reverses and reaches a low 800 years through the 1500 years of the YDS, the CO2 stays flat for the whole 1500 years.

So: pretty evident that CO2 follows temperature.