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I think the vibes have fully shifted on climate change damage estimates. Tyler Cowen posted this morning with a terse:
He's referring to this paper and this thread about it. They perform an empirical review of previous major estimates, focusing on replicating them and analyzing the methodology. One thing I found interesting is that they distinguished between damage estimates, themselves, and applications of damage estimates, like SCC. They say that the latter have already been show to be irreducibly uncertain, though even if the damage->SCC pathway was not irreducibly uncertain, they are arguing that since the damage estimates, themselves, are irreducibly uncertain, so too would be things like SCC.
They spell out multiple factors that create identification challenges and show how small changes to the inputs of prior models can result in huge changes in the outputs, in strange and unstable ways. They don't necessarily think prior authors did anything actively bad or malicious in their approach, just that the entire endeavor is probably doomed from the start:
Their tweet thread has the typical disclaimer needed to get out in front of the typical objections one would immediately hear upon taking such a position:
I feel a bit vindicated by the vibe change, because I had been arguing something similar a full decade ago at the old old old place, pretty much on my lonesome. Obviously, I didn't have the exact set of empirical critiques that these authors present today, but I feel like it's a good example of where you can have very strong theoretical knowledge in a related/relevant area (timescale-separated dynamical systems) that leads to a correct intuition along the lines of, "I don't actually have to know the details of the methods they're using (though I did look at several back in the day); I can't imagine they could possibly accomplish what they're setting out to accomplish, just because of the nature of the type of system they're working with."
What amazing news, thank you for sharing
I so happy that when I was ~12, my teachers thought it was wise to teach me and my entire class the world was doomed.
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