Carbon emissions from fossil fuels are projected to be less than 5.2 billion metric tons this year, the lowest since 1992, said Adam Sieminski, the head of the Energy Information Administration, the Energy Department's statistical and analysis arm.

"The drop in CO2 emissions is largely the result of low natural gas prices, which have contributed to natural gas displacing a large amount of coal used for electricity generation," he said, commenting on the agency's latest monthly energy forecast released Tuesday.

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