A new report from Rhodium Group suggested that the United States may have to play catch-up to regain progress in the fight against climate change following a year of volatile natural gas prices that led to more reliance on less expensive coal increased greenhouse gas emissions in 2021.

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In its report published on Monday, researchers said U.S. carbon emissions climbed 6.2% last year compared to the 10.3% drop the country saw in 2020.

Rhodium Group is a private research firm based in New York and is a founding member of the Climate Impact Lab with Rutgers University, University of California, Berkeley and the University of Chicago.

While more vehicles were back on the roads last year, researchers attributed most of the nation’s increase to the electric power sector’s 6%...