For sources, I would recommend just reading the technical summary of the 2014 IPCC Impacts report. There is no indication there that civilisation will end at 4 degrees.
I think a lot of the economic models are very flawed yes. I think it is more useful to look at the impacts literature and try and make your own mind up from there. But I also think it is instructive that the most pessimistic models suggest that 4 degrees of climate change would leave us with something like a 400% increase in GDP compared to a counterfactual 900% increase without climate change by 2100. There is absolutely no indication from any of the economic literature that civilisational collapse is on the cards, and that is an update, even if the models are bad, which they likely are.
For sources, I would recommend just reading the technical summary of the 2014 IPCC Impacts report. There is no indication there that civilisation will end at 4 degrees.
I think a lot of the economic models are very flawed yes. I think it is more useful to look at the impacts literature and try and make your own mind up from there. But I also think it is instructive that the most pessimistic models suggest that 4 degrees of climate change would leave us with something like a 400% increase in GDP compared to a counterfactual 900% increase without climate change by 2100. There is absolutely no indication from any of the economic literature that civilisational collapse is on the cards, and that is an update, even if the models are bad, which they likely are.