Researchers have developed a promising yet surprisingly simple modification to diesel engines that could hold the key to reducing the complexity, maintenance, and size and weight of emission aftertreatment systems.

Volkswagen AG vehicle owners can sue the carmaker over diesel-emission manipulation anywhere in the European Union, the bloc’s top court said in its first ruling on the scandal.

Amazon.com Inc. will buy an aviation fuel blend made from used fats, oils and greases over the next 12 months as it searches for ways to reduce the greenhouse gas emissions of its growing air cargo operations.

House Democrats say Congress should increase funding for programs at EPA and the Department of Energy to reduce emissions from equipment at ports.

House Democrats on June 30 will issue an ambitious plan to combat climate change, a move intended to reassure their base of supporters but that’s sure to inflame opponents on the right.

Four automakers backing a California effort to curb tailpipe emissions will break with some big rivals in the legal battle over the Trump administration’s relaxation of fuel efficiency standards.

The U.S. Justice Department denied politics played a role in its decision last year to open an antitrust investigation of four automakers that reached an agreement with California on fuel-efficiency standards.

Attorneys for the nation’s largest glider truck manufacturer have asked a federal judge for permission to seek a partial summary judgment to block an attempt by the IRS from collecting $83 million in back taxes and penalties.

The lowest level of North American Class 8 truck orders in modern times is not stopping fleets and engine manufacturers from pushing ahead to prepare for more stringent emission regulations. Companies are finding ways to squeeze out better fuel mileage and uptime performance from the next wave of diesel engines.

Volkswagen AG’s use of technology that helped it to cheat on diesel engine pollution tests violated European Union rules, an EU legal adviser warned in the second setback for the automaker at the bloc’s highest court this month.