The administration is closing in on deals with some close allies, but agreements with powers like China, Brazil and India are proving difficult.
More than 300 corporate leaders will ask the Biden administration to nearly double the emission reduction targets set by the Obama administration.
Michael S. Regan has said he intends to act aggressively in carrying out the president’s agenda of fighting climate change.
As Deb Haaland, President Biden’s choice for Interior secretary, heads toward a showdown vote, the department she would head is moving ahead on environmental policies.
The president will announce a suite of executive actions on Wednesday to combat climate change, two people familiar with his plans said, and will ask federal agencies to determine the extent of a drilling ban.
Joseph R. Biden Jr. will bring with him the largest team of climate change experts ever assembled in the White House, and action on global warming is expected quickly.
Ms. McCarthy will serve as a senior adviser to President-elect Joseph R. Biden Jr., coordinating climate change policy throughout the government.