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Actually old chap it was part of WIKIMEDIA or WIKI commons - which means someone has submitted it because they think it MIGHT be useful but it is not necessarily linked to any reference or discussion.
Which puts it firmly back into the "drew it meself with an etch-a-sketch" category
The hard part is getting people to understand that there are multiple interdependent variables at work, so even this "sudden flattening" (which only exists if you have never taken a statistics class) doesn't mean there's not a correlation between CO2 and temperature. You can't just look at temperature + one variable and expect to find anything meaningful.