WE HAVE FOLLOWED the UN’s overview of the costs of climate change impacts across different temperatures, and used the best estimate from Professor Nordhaus, and we have even added 25 percent to that. This has given us the best available estimate of the total costs of climate change at about 4 percent of GDP by 2100. This estimate is actually larger than the one provided by the 2018 UN climate panel report—the report that everyone uses to argue that we have a deadline of 2030 to act to prevent climate change. This report estimates that if we do nothing, the cost of global warming will reach 2.6
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