The hegemony of the USA is not threatened. It’s a pipe dream and has been for at least a decade.
The world is firmly multipolar now and if the USA refuses to help in tackling the problem we all face, it’s just going to find itself more and more marginalised on the global scene which is exactly what has been happening since the Trump presidency.
I think that's more wishful thinking on your part than truth frankly. And even if I grant your point, then you can sub in China or any other nation with sway on the global stage instead of the US and my point will still stand: If going green undermines the growth of that nation or it's political dominance then going green won't happen.
The world is firmly multipolar now and if the USA refuses to help in tackling the problem we all face, it’s just going to find itself more and more marginalised on the global scene which is exactly what has been happening since the Trump presidency.