The BBC reports that "research suggests [China's] greenhouse gas emissions have been underestimated, and probably passed those of the US in 2006-2007.
"The University of California team will report their work in the Journal of Environment Economics and Management.
They warn that unchecked future growth will dwarf any emissions cuts made by rich nations under the Kyoto Protocol.
"The team admit there is some uncertainty over the date when China may have become the biggest emitter of CO2, as their analysis is based on 2004 data.
"Until now it has been generally believed that the US remains 'Polluter Number One.'"
Attention Manmade Global Warming fanatics: China needs you. As soon as the airlines get their planes back in the air, go there.
They need you.