Forecasted GDP impacts are a bad measure of global warming. If insurance rates go up to 5% of property values reflecting destruction every 20 year frequency, and property gets rebuilt every time, there is no impact on GDP even if wealth and productive spending is decreased.

If we spend massive resources on immigrant detention and deportation, or AC bills, coffee, chocolate, and other scarcer food, that all contributes to GDP even if it results in lower quality of life by spending more on specific shit than we are used to.