COVID took a bite from greenhouse gas emissions

WASHINGTON — America’s greenhouse gas emissions from energy and industry plummeted more than 10% in 2020, reaching their lowest levels in at least three decades as the coronavirus pandemic slammed the brakes on the nation’s economy, according to an estimate published Tuesday by the Rhodium Group.

The steep drop, however, was the result of extraordinary circumstances and experts warned that the country still faced enormous challenges in getting its planetwarming pollution under control. In the years ahead, U. S. emissions are widely expected to bounce back once the pandemic recedes and the economy rumbles back to life — unless policymakers take stronger action to clean up the country’s power plants, factories, cars and trucks.

“The most significant reductions last year were around transportation, which remains heavily dependent on fossil fuels,” said Kate Larsen, a director at Rhodium Group, a research and consulting firm. “But as vaccines become more prevalent, and depending on how quickly people feel comfortable enough to drive and fly again, we’d expect emissions to rebound unless there are major policy changes put in place.”

Before the pandemic hit, America’s emissions had been slowly but steadily declining since 2005, in large part because utilities that generate electricity have been shifting away from coal in favor of natural gas, wind and solar power.

Transportation, the nation’s largest source of greenhouse gases, saw a 14.7% decline in emissions in 2020. While travel started picking up again in the latter half of the year as states relaxed their lockdowns, Americans drove 15% fewer miles overall last year than they did in 2019 and the demand for jet fuel fell by more than onethird.

Emissions from heavy industry, such as steel and cement, dropped 7% in 2020. America’s buildings, which produce carbon dioxide when they burn oil or natural gas for heat, saw emissions fall 6.2%, driven by both lockdowns and warmer than average weather.

In the electricity sector, emissions plunged by 10.3% in 2020.

Renewable energy surged in 2020. The U.S. produced roughly as much electricity from renewable sources last year as it did from coal, a milestone that has never been reached before.

Overall, the fall in emissions nationwide was the largest oneyear decline since at least World War II.