On the eating of crow...

[GliderGuider]

7. I think the decade around 2050 is when the wheels will fall off

CO2 will be at 550, the temperature will be closing in on +2.5C. All the dangers we were warned about for the end of the century will have arrived 50 years early. We won't be able to mitigate fossil fuel consumption to any appreciable degree before then, because people in general won't believe the problem is really this bad until after 2030. By that time we'll be even more locked into the pattern than we are today.

It's not about how hot it will be by the end of the century, it's about how hot it will be in less than 40 years.

I think the graph in the OP actually tells us when the end of civilization will happen. Not extinction - that will come some unknowable time later - but all the things that make civilization what it is will end. This realization is where the whole exercise of the last few days/weeks/years has been leading me.

"Be careful what questions you ask. You might not want to know the answers."