"U.S. and Canadian officials unveiled regulations [Friday] that would effectively overhaul the entire fleet of U.S. crude oil tank cars in five years."

"If Royal Dutch Shell’s Arctic drilling program leads to a major spill, it could cost the oil company — and therefore its shareholders — an entire year’s worth of profit, according to a Tuesday legal filing by the conservation group Oceana and a University of Chicago law clinic."

"The White House has threatened to veto a Republican bill that would repeal a controversial Environmental Protection Agency clean water rule."

"CUPERTINO -- The Lehigh Hanson cement plant, a longtime producer of Silicon Valley building materials but also a significant polluter, will pay $7.5 million as part of an agreement with the U.S. Environmental Protection Agency to settle charges it dumped millions of gallons of toxic wastewater into a nearby creek."

"A Senate committee passed a bill Tuesday that would reform the federal government’s regulation of toxic chemicals for the first time in decades."

"The Department of Justice won't challenge a federal court ruling that the Department of Agriculture and the Small Business Administration violated environmental laws in providing loans to a large hog farm in northwest Arkansas."

"A federal appeals court ruled Friday that a group of California companies cannot sue to stop the Environmental Protection Agency’s (EPA) efficiency and greenhouse gas rules for heavy trucks."

"Congress on Tuesday passed a bill focused on improving energy efficiency in buildings and water heaters, a move celebrated by both parties for breaking longstanding partisan gridlock."

"Lawsuit helped force an update of emissions standards for dangerous chemicals that went unchanged nearly 30 years."

"After a series of deadly accidents, Congress created an office to oversee the nation’s oil and gas pipelines. A decade later, it’s become the can’t-do agency."