New guidance from the Energy Department would prevent people from receiving rebates after making such swaps.

© Bing Guan for The New York Times

The rules were established by the Biden administration after research linked the compounds to a range of serious health problems.

© Haiyun Jiang/The New York Times

The administration is delaying a phaseout of hydrofluorocarbons, potent planet-warming chemicals used in air-conditioning and refrigeration.

© Gene J. Puskar/Associated Press

The finding effectively paves the way for continued use of atrazine, a widely used herbicide that has been linked to birth defects and cancer in humans.

© Julie Ingwersen/Reuters

A new wave of start-ups are trying to harvest emissions-free energy from inside the Earth, but the industry still faces significant challenges.

© Eduardo Munoz/Reuters