Honestly the US is not a driving force in the international climate movement. US activists are, but the US as a country has been rather slow in dealing with the situation.
Then China does China and the US has very little influence over them. They built a lot of green technology and deploy it at a massive scale, but also increase emissions every year. I honestly doubt that would change with another US president.
Russia is even worse. They make money from selling oil and gas and also profit a lot from global warming as that turns a lot of Siberia and the Far East into arable land.