Report: China passed US as top carbon polluter

China has surpassed the US to become the world’s largest emitter of carbon dioxide, according to a study by researchers at the University of California, AFP reported. The report, which compiled information on fossil-fuel usage in China, projected an 11% increase in carbon dioxide emissions between 2004 to 2010, far above earlier estimates of a 2.5% rise. "Our best forecast has China’s CO2 emissions correctly surpassing the United States in 2006 rather than 2020 as previously anticipated," the report said. The study will be published in May in the Journal of Environmental Economics and Management.