"The Trump administration relied on flawed logic to justify scrapping vehicle emissions standards this year, making errors in how it accounted for fuel savings, the price of technology and mileage, according to a new study by a group of economists.

Correcting those errors would negate the economic benefits that the administration said would come from eliminating greenhouse gas emission standards for cars and trucks, according to the paper published Thursday in the journal Science.

"[T]he EPA is moving forward with revisions to a separate set of Clean Water Act regulations that would limit state and tribal authority over waterways—especially when it comes to weighing in on major energy projects like oil and gas pipelines, export terminals and hydropower dams."

"Construction on — or at least preparations for — a border wall through Texas’s Big Bend National Park and the larger Big Bend region have been halted through Sept. 15, and possibly longer, a federal judge said from the bench Friday."

"The Trump administration on Friday moved to relax fuel efficiency standards for medium- and heavy-duty commercial trucks."

"As the new school year kicks off, school districts are facing a challenging math problem: the high cost of diesel. The price of a gallon of diesel is up nearly $2 compared with this time last year. That is meaningful for schools, considering that around 90% of the United States' 480,000 school buses run on diesel."

"A major Canadian oil and gas company reported dozens of incidents at its pipelines after the provincial regulator exempted thousands of its pipelines from normal clean-up timelines."

"Canada announced retaliatory tariffs as high as 50 percent on hundreds of American products on Tuesday, just days after the collapse of trade talks triggered punishing tariffs from the Trump administration." "Canada said the higher levies, on items from aluminum foil to dishwashers to fish, would help protect workers, producers and manufacturers harmed by new Trump tariffs."

"President Trump has been scornful of electric cars for years. But his administration is now pouring billions of dollars into the battery technology that powers them."

"Prime Minister Mark Carney said Canada will return to the negotiating table when the U.S. shows the “right attitude,” not treating Canada as a subsidiary of the United States. U.S. President Donald Trump made further threats on U.S.-Canada trade early Monday, saying in an online post that tariffs on Canadian automobiles, car parts and steel will increase to 50 per cent on Jan. 1."

"A helicopter swooped through the bright blue sky, as a pilot scanned the high desert below for wild horses running through the dusty sagebrush, about an hour's drive west of Meeker, Colorado. A small group of reporters and horse lovers watched from the cover of wizened trees, about a mile from a pen that would trap the horses."