I'm most hopeful about the carbon border tariff. People, and by extension political communities are more willing to take action when they feel able to pass costs onto others vs. feeling like they have to bear it themselves.

If leading markets can create bubbles where carbon is accurately accounted for, the free-rider problem can be substantially alleviated and we might be able to finally make some progress on climate.

I'm less hopeful about new fuel taxes. We've seen how that's gone in France, and even Switzerland.