Ronnie B. Levin spent 37 years at the E.P.A. working on lead exposure. She retired in November after what she described as months of low morale at the agency.
Kathleen Hartnett White at Trump Tower in Manhattan in 2016.
Mount Pinatubo in 1991
New panels in India. Solar power accounted for more than a third of all electricity from energy sources that came online in 2017.
Andrew K. Wheeler will serve as acting Environmental Protection Agency administrator while President Trump seeks a successor to Mr. Pruitt.
Air-conditioners on a building in Fuzhou, China. A new report predicts that the number of air-conditioning units worldwide will rise from 1.6 billion today to 5.6 billion by midcentury.
A northern spotted owl in Point Reyes, Calif.; protections for the owls led to debate over the economies of communities concentrated around timber harvests.
A technician searching for methane leaks with an infrared camera in Damascus, Ark.
Scott Pruitt, the Environmental Protection Agency chief, at the White House on Tuesday.
Scott Pruitt, the Environmental Protection Agency administrator, with his top policy adviser, Samantha Dravis, at Trump Tower in 2016. Ms. Dravis has resigned.
Scott Pruitt, the E.P.A. chief.
E.P.A. workers investigating PCB levels in runoff in Minden, W.Va., in May.
A fin whale was carved up last month at Iceland’s only whaling station, in a fjord north of the capital, Reykjavik.
Mitch Bainwol, left, the auto industry’s top lobbyist, with Mr. Pruitt at an event last month announcing the proposed rollback of Obama-era auto emissions rules.
President Trump at the White House on Friday with administration officials and auto industry executives.
A North American beaver in Denali National Park and Preserve in Alaska.
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