China's gross domestic product is between 400 and 1,000 US dollars per
capita, but its pollution levels are similar to those in western countries
with a GDP per capita of between 3,000 and 10,000 dollars.

Unprecedented pollution in China’s seas
http://www.asianews.it/view.php?l=en&art=3661
....
Sixteen out of the world’s 20 most polluted cities are found in China.
Much of the pollution comes from the use of coal to produce energy; coal
stations produce 75% of necessary energy.
....
http://www.asianews.it/view.php?l=en&art=3568

Do the math:

In the US there are about 745 vehicles per 1,000 persons.
In China there are about 8 vehicles per 1000 persons.

Today
China pop. 1,300,000,000 * (8/1000) = 10,400,000 cars
US pop. 296,555,646 * (745/1000) = 220,520,000 cars

FUTURE Year 2025 ( est. pop. )
China pop. 1,500,000,000 * (745/1000) = 1,117,500,000 cars
US pop. 349,000,000 * (745/1000) = 260,000,000 cars

[not incl. motorcycles, buses or lawnmowers...]

Stick your Kyoto Treaty up your ass!