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The pollution-control gadgets are full of precious metals like palladium, and prices are soaring as regulators try to tame emissions. Crooks with hacksaws have noticed.

The administration plans to release $1.3 billion that was meant to help Puerto Rico rebuild after Hurricane Maria in 2017, and will remove restrictions on another $4.9 billion.

General Motors said it would no longer back President Trump’s effort to strip California of the power to set fuel economy standards.

A new E.P.A. policy on perchlorate, which is used in rocket fuel, would revoke a 2011 finding that the chemical should be regulated.

The Trump administration has finalized new fuel efficiency standards, lowering expectations from 54 miles per gallon by 2025 to 40 miles a gallon by 2030.

The White House, hoping to speed infrastructure projects like pipelines, will formally introduce changes to a half century-old landmark environmental law.

In one of its first environmental acts, the Trump administration absolved businesses from responsibility for "incidental" bird deaths. Avian carnage has followed.

Robert E. Murray, the former chairman of Murray Energy, gave nearly $1 million to climate denial groups and other organizations seeking to undo environmental regulations.

The United States notified the United Nations on Monday that it would leave the Paris climate agreement, starting the clock on a yearlong withdrawal process. 

Anxious about the future and angry about the failure to curb the crisis, millions joined an urgent call for action against climate change.

The move, expected Wednesday, would strip California of its special authority to set tougher rules on car emissions. 

If the proposal is adopted, the government would no longer require oil and gas companies to inspect for and repair methane leaks from wells and pipelines.

Mr. Sanders’s climate change proposal calls for the United States to eliminate fossil fuel use by 2050. “We must be extraordinarily aggressive,” he said in an interview.

The project’s reversal of fortunes has angered environmentalists and focused attention on an unusual connection between a Chilean billionaire and President Trump’s family.