Energy-related carbon emissions reached a record level last year, according to the International Energy Agency (IEA).
The watchdog says emissions rose again after a dip caused by the financial crisis in 2009, and ended 5% up from the previous record in 2008.
China and India account for most of the rise, though emissions have also grown in developed countries.
The increase raises doubts over whether planned curbs on greenhouse emissions will be achieved, the group says.
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