"A big oil spill from the Keystone Pipeline in North Dakota last week has hardened opposition to the controversial Keystone XL expansion among landowners along its route, who say they hope to use the incident to help block or stall the project in court."

"Over the course of three years, NASA flew a plane carrying gas-imaging equipment above California and made a discovery that surprised even the state’s own environmental agencies: A handful of operations are responsible for the vast majority of methane emissions."

"Attorneys arguing before the Supreme Court today attempted to turn water into whiskey. The justices searched for a standard of controlling pollution that travels through groundwater that would block regulated entities from evading the Clean Water Act while avoiding a significant expansion of the statute's federal permitting requirements."

"The Senate is prepared to walk away from provisions of a defense policy bill that would compel the Environmental Protection Agency (EPA) to regulate a cancer-linked chemical that is leaching into the water supply, Sen. James Inhofe (R-Okla.) told reporters Tuesday."

"New York state’s attorney general is suing The Chemours Co., 3M Co., DuPont de Nemours Inc. and other companies for their alleged role in making and selling persistent chemicals that are environmental contaminants."

"The last time Jeff Holmstead and John Walke sat at the same congressional witness table, they tangled vigorously over an industry-backed proposal to overhaul EPA's New Source Review program."

"After months of wrangling between local officials over whether to settle the case, justices for the nation's highest court are poised to hear arguments tomorrow [Wednesday] in County of Maui v. Hawai'i Wildlife Fund, a heated debate over the scope of the Clean Water Act."

"Hundreds of thousands of Canadians have been unwittingly exposed to high levels of lead in their drinking water, with contamination in several cities consistently higher than they ever were in Flint, Michigan, according to an investigation that tested drinking water in hundreds of homes and reviewed thousands more previously undisclosed results."

"Emissions of a banned ozone-destroying gas that had risen unexpectedly since 2012 appear to have declined in the last two years, according to preliminary data reported by scientists on Monday."