Tax imports of products that pollute as part of their manufacturing process. There, this both evens the paying field, creates an incentive for everyone to play ball, and promotes non-polluting economic growth.
That's reasonable, but hard to enact without inviting retaliation. I'm not sure if the resulting retaliation would make the overall policy a net win or loss.
We regulate pollution, China mostly doesn't. It's not clear to me what policy you think the West should adopt to fix this.