From BBC News:
China has already overtaken the US as the world’s “biggest polluter”, a report to be published next month says.
The research suggests the country’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.
Read also Forecasting the Path of China’s CO2 Emissions Using Province Level Information by Maximilian Auffhammer and Richard T. Carson.