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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.

Climate change is upending the world as we know it, and coping with it demands widespread, radical action.

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

The idea of modifying Earth’s atmosphere to cool the planet, once seen as too risky to seriously consider, is attracting new money and attention.

Metronome’s digital clock in Manhattan has been reprogrammed to illustrate a critical window for action to prevent the effects of global warming from becoming irreversible.

A president who has mocked climate change and pushed policies that accelerate it is set to be briefed on the scorched earth and ash-filled skies that experts say are the predictable result.

At a meeting last year, industry leaders contradicted public claims that emissions of climate-warming methane are under control

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 agency is changing the way it calculates the benefits of mercury controls, a move that would effectively loosen the rules on other toxic pollutants.

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.

Australia is going up in flames, and its government calls for resilience while planning for more coal mines.

The Trump administration has finished a new rule that rolls back environmental controls on many wetlands and intermittent streams, delivering a win to rural landowners.

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.

Countries agreed to rein in emissions in an effort to avert climate catastrophes. They've failed, according to the latest United Nations report.