Overturning the 2009 decision will lead to billions of extra tonnes of greenhouse-gas emissions over the next three decades.

Warming is occurring across most U.S. states, though the pace and type of temperature changes vary widely from region to region.

The 2009 endangerment finding affirms that carbon dioxide and other greenhouse gases pose a threat to human health and welfare. Its repeal marks one of the most significant deregulatory actions in U.S.

The ongoing string of executive orders, federal agency actions, Congressional lawmaking and court cases relating to climate change and the clean energy transition has become one of the hard swerves in federal policy defining the second Trump administration.

President Trump and his team held a “Clean, Beautiful Coal” event this week and are rescinding a rule that enables the EPA to regulate greenhouse gases. But the moves come as renewable energy sources including solar are increasingly in demand.

A White House official says the Trump administration is expected this week to revoke a scientific finding that long has been the central basis for U.S. action to regulate greenhouse gas emissions and fight climate change.