National (U.S.)

"A new study is asserting a link between climate change and both the intensifying California drought and the polar vortex blamed for the recent harsh winter."

A major supplier to the oil and gas industry says it will begin disclosing 100 percent of the chemicals used in hydraulic fracturing fluid, with no exemptions for trade secrets. The move by Baker Hughes of Houston is a shift for a major firm; it's unclear if others will follow suit."

"A day after Canada issued stringent new rules for the transportation of oil by rail, federal regulators in the United States said on Thursday that they would push forward their own tank standards next week, potentially resolving a critical safety issue that has been mired in regulatory limbo for years."

"In the ongoing battle over offshore drilling, a federal judge in Alaska told regulators Thursday to redo an environmental impact study that underestimated the amount of recoverable oil and, potentially, the risks to delicate Arctic habitat."

"The Food and Drug Administration will for the first time regulate the booming market of electronic cigarettes, as well as cigars, pipe tobacco and hookahs, under a proposal to be released Thursday."

"After almost two decades of reports, hearings, failed proposals and political wrangling, federal regulators on Wednesday announced sweeping changes to protect coal miners from black lung disease."

"PALO ALTO, Calif. — The egg white drone lifted off from its ground station at a hospital construction site here, hovered for an instant, then zoomed off, sounding like a five-pound bee as it buzzed around the cranes towering over the six-acre project."

"Baltimore has joined with other major U.S. cities in defending the federal government's authority to impose a 'pollution diet'  on the Chesapeake Bay."

"Nestled into a seaside forest on the University of British Columbia's lands, amid a carpet of sword ferns and salal, sits a gleaming industrial facility that's been hailed as a significant step toward a carbon-neutral future for B.C., Canada and even the world."

"WEST, Texas -- Although the cause of the deadly blast at West Fertilizer Co. remains a mystery, a federal agency on Tuesday said the tragedy was preventable, citing shortcomings in existing regulations and standards at all levels of government."