Mount Pinatubo in 1991
The new regulations would also challenge California's authority to set its own emissions marks, which it seeks to keep at the tougher, Obama-era standards.
The Golden Gate Bridge in San Francisco. California has vowed to stick to its own stricter auto emissions standards even if the Trump administration relaxes federal rules.
Innaarsuit, on the west coast of Greenland, this week. The iceberg rises about 300 feet above the water level.
The remains of a house in Perryville, Mo., after a tornado.
The site of an Enbridge pipeline in Kinosis, Alberta. The E.P.A. has signed off on a proposal to expand one of its lines.
Scott Pruitt, facing a photograph of Yosemite National Park, on Capitol Hill in April.
A northern spotted owl in Point Reyes, Calif.; protections for the owls led to debate over the economies of communities concentrated around timber harvests.
Refrigerators at a dump in New Orleans in 2006 after Hurricane Katrina. Chlorofluorocarbons were once commonly used as a refrigerant in appliances like these, but have been banned since 2010.
Hint: It will require more than just an umbrella.
Andrew K. Wheeler will serve as acting Environmental Protection Agency administrator while President Trump seeks a successor to Mr. Pruitt.
Geese swimming in Izembek Lagoon in the Izembek National Wildlife Refuge, Alaska.
A shipwrecked migrant in the Mediterranean in November. New research suggests that weather shocks are spurring people to seek asylum in Europe.
“Glider” trucks on a dealer’s lot in Tennessee. The cab-and-chassis kits can be fitted with older, less efficient engines that emit more pollution than modern ones.
Solar panels on the roof of a Walmart in Baldwin Park, Calif.
Tori Venable, Tennessee state director of Americans for Prosperity, left, helping volunteers in Nashville prepare for canvassing against a mass-transit proposal.
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