[agere_contra]

I forgot to mention: The Younger Dryas temperature change was not completely global: in particular Antarctica would have missed it.

But the CO2 change WAS global thanks to excellent mixing. So a CO2 signal from ice from Antarctica shouldn’t be uncritically compared against an Antarctica temperature proxy. Compare the CO2 behaviour against as many global temperature proxies as possible.

[agere_contra]

Lastly: WattsUp references this key paper which gives an excellent breakdown of the Global temperature proxies used.

It's obvious that there are a wealth of global temp proxies in a cloud around the CO2 results. The Shakun authors must have used an industrial cherry-picking machine to find the proxies that suited their purpose.