Pollution is a growing concern in the world's second-largest economy, whose cities are regularly blanketed by choking smog -- much of it the result of burning coal, which provides most of China's primary energy.
The updated figures suggest that Chinese emissions of greenhouse gas carbon dioxide -- already the world's largest -- are bigger than previously thought.
The news comes weeks before a UN summit in Paris, where nations will seek an agreement on tackling climate change, in the face of divisions over how the burden should be divided between countries.
But in the latest edition, the same number for the same year was given as 4.12 billion tons -- a rise of nearly 600 million tons, or almost 17 percent.
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The increase was equivalent to over 70 per cent of the United States' annual coal consumption, said the New York Times, which first reported the changes.
The figures implied that China's annual carbon dioxide emissions had been underestimated by more than Germany's total yearly output, the newspaper added.
Figures as far back as 2000 were changed, according to comparisons by AFP of different editions of the China Statistical Yearbook, published by the National Bureau of Statistics (NBS).
There are widespread doubts over the accuracy of official statistics in China, which critics say can be subject to political manipulation.
But at a coal forum in Beijing, Zhou Fengqi, an adviser to the National Development and Reform Commission, China's top planning body, said: "The new figures are more accurate than before."
The data has depended on incomplete provincial statistics, he said.
"Now the national figures have progressed and more accurately reflect the situation."
Song Guojun, professor of environmental economics at Renmin University, said the adjusted figures were "certainly more reliable".