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The Chinese government has promised to halt the growth of its emissions of carbon dioxide, the main greenhouse pollutant from coal and other fossil fuels, by 2030. The new data suggest that the task of meeting that deadline by reducing China’s dependence on coal will be more daunting and urgent than expected, said Yang Fuqiang, a former energy official in China who now advises the Natural Resources Defense Council.

This is troublesome because many forecasts and commitments were based on the previous data

“This will have a big impact, because China has been burning so much more coal than we believed,” Yang said. “It turns out that it was an even bigger emitter than we imagined. This helps to explain why China’s air quality is so poor, and that will make it easier to get national leaders to take this seriously.”

The adjusted data, which appeared recently in an energy statistics yearbook published without fanfare by China’s statistical agency, show that coal consumption has been underestimated since 2000, and particularly in recent years. The revisions were based on a census of the economy in 2013 that exposed gaps in data collection, especially from small companies and factories.

Illustrating the scale of the revision, the new figures add about 600 million tons to China’s coal consumption in 2012 — an amount equivalent to more than 70 percent of the total coal used annually by the United States.

“It’s been a confusing situation for a long time,” said Ayaka Jones, a China analyst at the U.S. Energy Information Administration in Washington. She said the new data vindicated her earlier analysis of China’s preliminary statistics, which flagged significantly increased numbers for coal use and overall energy consumption.