"The arrival of four federal investigators at Grand Canyon National Park this week reopened old wounds and threatened to topple a woman regarded by many as one of the top stars in the National Park Service."

"Chad Walde believed in his work at Los Alamos National Laboratory. Then he got a rare brain cancer linked to radiation, and the government denied it had any responsibility."

"In the first such use of his executive powers, President Trump on Friday designated a national monument, establishing a 380-acre site in Kentucky to honor African Americans’ role as soldiers during the Civil War."

"A group of 20 U.S. states and several major cities on Friday urged the Trump administration to abandon a proposal to freeze fuel efficiency standards after 2020 and strip California of the ability to impose its own vehicle emissions rules."

"The administration is auctioning off millions of acres of drilling rights and rolling back regulations, raising environmental concerns in states like Wyoming."

"Glyphosate is in a bunch of popular cereals and oatmeals—but at levels below federal health standards. Experts say it's difficult to estimate risk from the levels found but the report is still worrisome since children are consistently exposed."

"The White House requested a PowerPoint presentation for President Trump from a group devoted to attacking climate science."

"The research the Environmental Protection Agency (EPA) cited in proposing to roll back a major truck pollution rule was “not accurate,” the university that conducted the study has concluded."

"Scientists have classified 18 US volcanoes as “very high threat” because of their activity and proximity to people."

"Even as the Environmental Protection Agency has been trumpeting its efforts to find and clean up contamination from industrial chemicals known as PFAS, it has been allowing new chemicals in this class to enter into commerce, according to data from the agency."