it looks like the line marked gold metalworking is the same, although hard to tell for sure. But long periods of history were at least pretty close to today's remperature according to that graph
Earth warmth comes from CO2 blanket, we can't suck it from atmosphere, we hardly can reduce CO2 production worldwide.
Also his "best case scenario" is humanity wiped from Earth ten years ago, not base case for me. "Optimistic scenario" is if world acted on current policies. And "current path" is denial (4°C–5°C raise).
This is kinda missing the point. Look at the slope. And think how a system responds to a gentle slow perturbation and how it responds to a fast drastic change.
1. No, the gold metalworking part is lower on the graph. 2. It's the slope of the change - systems that evolve over millennia aren't set up to adjust over decades
