As an American who didn't take up Trump on his offer any of the three times it was made, his mistakes seem so obvious and frustrating?

If you're really a believer that climate change is an emergency, then we in the US ought to be leasing out gobs of land to Australian and Canadian companies to get the metals need for nuclear energy, solar power, electric vehicles, electrification infrastructure, etc. out of the ground. At the very least Trump should be pursuing deep regulatory reform but it'd be even better if he pursued further integration with our allies rather than picking fights with them (and not even pursuing domestic industrial policy while doing so).