When you're talking a planetary atmosphere, "per capita" isn't the prime factor.
Face it, the people pushing this aren't interested in going after China, no matter what they're shoving into the air. It was obvious that China and India were going to be major problems a long time ago, yet the original Kyoto treaty wrote them out, and nobody said "boo."
They weren't the targets, you see.
This wasn't about emissions for the Kyoto proponents, and frankly, for most of those leading this movement, it never was.