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China is on course to overtake the United States this year as the world's biggest carbon dioxide producer, according to estimates based on Chinese energy data.
The finding might pressure Beijing to take more action on climate change.
China's emissions rose by about 10 percent in 2005, a senior U.S. scientist estimated, while Beijing data shows fuel consumption rose more than 9 percent in 2006, suggesting China would easily outstrip the United States this year, long before a forecast.
Taking the top spot would put pressure on China to do more to slow emissions as part of world talks on extending the United Nations' Kyoto Protocol on global warming beyond 2012.
Thirty-five developed nations have agreed to cut emissions in accordance with Kyoto and they want others, especially the United States and China, to do more. China and India were not included in the pact because they are considered developing countries, which was one reason the United States did not sign it.
"It looks likely to me that China will pass the United States [in emissions] this year," said Gregg Marland, a senior staff scientist at the U.S. Carbon Dioxide Information Analysis Center, which supplies data to governments, researchers and nongovernmental organizations worldwide.
"There's a very high likelihood they'll pass them in 2007."
Carbon dioxide is produced by burning fossil fuels such as coal, oil and gas for heat, power and transportation. Many, but not all, scientists say it is a key contributor to global warming.
Mr. Marland used fossil fuel consumption data from oil company BP to calculate China's carbon dioxide emissions in 2005 at 5.3 billion tons, versus 5.9 billion for the United States, with respective growth in 2005 of 10.5 percent and less than 0.1 percent.
In 2006, Chinese fuel consumption rose 9.3 percent to the equivalent of 2.4 billion tons of coal that year, the deputy head of the office that advises China on energy policy, Xu Dingming, said on Thursday.




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