By voting for politicians who contribute and participate in international regulation, like the Paris Agreement, instead of just quitting them.

Taking serious steps to make changes in your own country before requesting changes in others.

India emits less than half the CO2 that the US does, and almost an order of magnitude less per capita. The US has a long way to go toward getting its own climate policy in order before it should be telling India to make changes.

International agreements is one of the solutions which climate advocates are calling for. USA voters probably have more power then anyone in calling for such agreements and that they would be enforced.

I'd say voting in officials who are willing to pressure these nations

They generate co2 in mostly to produce goods that are consumed in western countries... pollution was just outsourced

How about we do something about what we can control rather than drag each other down like crabs in a bucket?

Import tariffs and immigration quota reduction for countries not doing their part.