Adaptation should be about increasing water storage, storm defense and concentrating on uninterrupted energy supply. Research money should be spent on new energy technology and better climate forecasting.
Right now we have billions being spent on innefectual or worse solutions, because the responses are based on 20 year-old understanding of climate sensitivity, which has proven to be incorrect by several orders of magnitude.
If Illinois does turn into Texas, what you absolutely dont want is having sent the previous fifty years wasting your productive capacity on worthless solutions.
FWIW, I agree with you that the cause matters less than the effects.
> Allowing a country like China or India to be the first to develop reliable, cheap, renewable energy would be a total game changer that could leave us as an also-ran country or vassal state.
I don't see how this happens, unless a bunch of other things also happen to go wrong at the same time. China would have to start respecting other countries' IP rights for real, and patents would only keep things locked up for so long. And it's not like China or India would have a monopoly on understanding and improving whatever that new technology is.
Anything serious enough to raise the specter of "vassal state" and the US would just ignore IP rights pretty much the same way China ignores foreigners' IP rights out of self-interest.
I still see climate change as possibly causing billions or trillions dollars of economic harm, so it's worth addressing.