The three-count indictment alleges that Midwest Grain Products Inc. and Harcros Chemicals Inc. violated the Clean Air Act.
The red spruce is making a comeback in Eastern US forests after being decimated by acid rain decades ago, thanks to stricter pollution restrictions.
Federal lawsuit alleges the German automaker intentionally tampered with the vehicles sold in the US.
Part of the settlement is $2 million fund to pay for expenses related to respiratory health of the Navajo Nation that lives nearby.
US Supreme Court hears arguments in case that deals with climate change, executive power.
Plan is to curb emissions, boost efficiency and expand renewable energy.
US Court of Appeals denies industry challenges, dismisses others.
Global warming and the need for greater energy security is fuelling the search for even more the fuel-efficient vehicles. The most readily available option is the diesel engine.