How much money should we spend?
Let’s spend nothing. Scrap all the carbon clauses, the subsidies to inefficient energy, the grants to climate models we know are broken. One-sided funding to scientists seeking a crisis has done more harm than good to science, but it has engendered a lot of namecalling. Unless there is a change, climate science will advance faster if the government gets out of the way. I have yet to see a single observational study suggesting we will improve the weather with carbon credits or windmills and solar panels. We could save lives and spend the money on medical research instead. The opportunity cost is ignored.