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When using such graphs as proof of something, one must always first ask, what came before or after the chosen dataset. In this case, why did they cut off the analysis at D - 800000 years. 800000 years is still but a blink in earths climate. And it is well documented that CO2 levels in the dinosaur times were far higher than now. Which is precisely why there was such abundant plant growth that allowed for the megafauna.
Call me not convinced on your listed graph. But take a look at the following one:
View attachment 504796
I don't disagree with anything in your post. I'm guessing that the chart I posted, and you questioned, was depicting a period of time immediately prior to and during the time humans inhabited Earth.