"A panel of appeals court judges scrapped a Trump-era rule yesterday that it said did not set strong enough restrictions on downwind states' exposure to smog-forming air pollutants produced by upwind neighbors."

"A coalition of New England and mid-Atlantic states on Tuesday took a first step toward limiting transportation emissions across 13 states."

"Global energy-related CO2 emissions are expected to jump roughly 20% between today and 2050, according to a report yesterday from the U.S. Energy Information Administration."

"China has denounced a landmark U.N. deal that caps emissions from international flights, in a setback for an industry eager to placate the growing international movement to curb air travel’s impact on the environment."

"Environment ministers from dozens of countries agreed this week to hasten their efforts to reduce a class of greenhouse gases that, until now, has been largely overlooked in international climate agreements but could play a crucial role in limiting the worst effects of climate change."

"The political war between California and the Trump administration escalated Monday with a letter from Andrew Wheeler, the head of the Environmental Protection Agency, warning that Washington would withhold federal highway funds from the state if it did not rapidly address a decades-long backlog of state-level pollution control plans."

"The Trump administration is ratcheting up its threats against California with a letter warning the state faces sanctions – including cuts in federal highway funding – over its “failure” to submit complete reports on its implementation of the Clean Air Act."

"U.S. President Donald Trump and the state of California went to war on Wednesday over who should set the standards in the United States for vehicle emissions and electric cars, foreshadowing a legal battle over environmental policy issues that will affect the auto industry and consumers."

"The Trump administration is expected on Wednesday to formally revoke California’s authority to set auto emissions rules that are stricter than federal standards, taking a major step forward in its wide-ranging attack on government efforts to fight climate change."