I don't think any economic models are reliable in the event of 4 degrees of warming. The system is far too complex to forecast with any precision. We can concl

I don't think any economic models are reliable in the event of 4 degrees of warming. The system is far too complex to forecast with any precision. We can conclusively say it would be bad, but "how bad" can't be stated quantitatively. Only qualitatively, in terms of "X percent of land would be rendered uninhabitable" or "X% increase in crop failures". Those are numbers, of course and can be estimated better. I'm saying they can't be combined to a global gdp total. The system is too large, and there will be cascading effects. Some sort of war is also a likely result, and then all bets are off.