"U.S. President Donald Trump signed an order on Tuesday directing environmental regulators to review an Obama-era rule that expanded the number of federally protected waterways as the president targets regulations that conservatives consider government overreach."

"WPX Energy Appalachia has paid a $1.2 million civil penalty for oil and gas violations that affected groundwater and private water supplies in Westmoreland County."

"A natural gas pipeline has been leaking since at least Feb. 7 and the company says it can't safely stop the flow of gas." "Natural gas from a 52-year-old underwater pipeline has been leaking for at least two weeks into Cook Inlet in Alaska, home to a number of endangered species, including beluga whales."

"A pregnant woman's exposure to air pollution has adverse effects on her fetus, according to a new international study, with prolonged exposure associated with nearly 1 in 5 premature births globally."

"A new study looks at fracking sites in four states, finding 6,648 spills between 2005 and 2014. Their research, the study's authors say, highlights a need for better data collection – and may help prevent future incidents."

"BLACKSTONE, Va. — A conservative Virginia Republican said he supports some U.S. EPA efforts and believes the climate is changing during a boisterous town hall last night in a rural part of the state."

"President Trump has vowed to roll back regulations on business, and automakers are wasting no time in pushing his administration to make good on the promise."

"Dusty mounds of petroleum coke are gone from Chicago, but federal and city officials discovered a potentially more dangerous type of pollution while investigating the black piles that once towered above the East Side neighborhood."

"A Globe review shows water treatment plants are failing on reserves across Canada. For every system the government fixes, plenty remain in a shambolic state."

"Leather processing is big business in Bangladesh, India, and other parts of the developing world, where regulations are lax and poisons run freely."