The problem with that is that anything that most things that have the biggest effect here (not eating meat, not travelling a ton, etc) are also things that no g

The problem with that is that anything that most things that have the biggest effect here (not eating meat, not travelling a ton, etc) are also things that no government in the world would have support for limiting, and if they tried to regulate them, would probably get destroyed in the next election. Could you regulate some stuff? Sure, but anything that's remotely unpopular feels like a recipe for the opposing party to win by a landslide just by promising to remove said regulation. Or for someone who doesn't give a toss/is basically anti environmentalist to get elected, ala Bolsonaro in Brazil.