"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."

"EPA must go back to the drawing board on part of its Cross-State Air Pollution Rule update, a panel of federal judges ruled today [Friday]."

"President Trump is strongly considering a plan to revoke California’s legal authority to set state tailpipe pollution standards that are stricter than federal regulations, according to three people familiar with the matter."

"The U.S. Chamber of Commerce is splitting with President Trump over his rollback of Obama-era clean car standards."

"The Trump administration is set to announce on Thursday that it intends to sharply curtail the regulation of methane emissions, a major contributor to climate change, according to an industry official with knowledge of the plan."