Just as a quick jab, maybe I want poor Canadians to be paid by rich beachfront property owning Miamians? Just something to think about.
Hmm, a sort of environmental extortion racket? I like it, but somehow the Canadians don't strike me as quite the type to try it. Maybe I'm wrong about that.
Inflation: It would cost more today to retard economic growth and combat climate change than it will in 2025.
Are you sure? Because while the relevant technologies will have no doubt advanced by 2025, the scale of the problem will be that much larger by that time as well. It's not obvious (to me anyway) how one would predict where the "sweet spot" would be, or if there even is going to be one -- it's entirely possible that the problems will continuously grow faster than the technology needed to solve them, so that it will never be cheaper or easier to combat climate change than it is today.