Climate change caused by greenhouse gases is warming the United States, though unevenly, government researchers said Thursday.

“The continent as a whole is warming, mostly as a result of the energy sources we are using,” William J. Brennan, acting administrator of the National Oceanic and Atmospheric Administration, said at a briefing on the nation’s climate since 1951.

But there is a “warming hole” where no change occurred in the center of the country, roughly between the Rocky Mountains and the Appalachians, added Martin Hoerling of NOAA’s Earth System Research Laboratory.

Last year the International Panel on Climate Change, studying the planet as a whole, concluded that global warming is “unequivocal, is already happening, and is caused by human activity.”

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