China becomes world's top carbon dioxide emitter

According to the AP:

"China overtook the United States in carbon dioxide emissions by about 7.5 percent in 2006, according to the Netherlands Environmental Assessment Agency's report."

Oh, and let's not forget:

"China signed the 1997 Kyoto Protocol, which caps the amount of carbon dioxide that can be emitted in industrialized countries. But China is exempt from emission reductions because it is considered a developing country, a situation often cited by the U.S. and Australia for rejecting the treaty."

So who was right?