"Even though Maryland has yet to permit any hydraulic fracturing for natural gas, emissions linked to the controversial drilling technique have been detected in the air in Baltimore and Washington, according to a new study."

"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."

"Duke Energy, the largest electric utility in the US, has agreed to provide dozens of families in North Carolina with bottled water after state testing found private wells near sites where the company stores coal waste contaminated with potentially toxic chemicals."

"Scientists, planes and instruments descend on San Juan Basin to find roots of the massive greenhouse gas hotspot."

"NEW YORK — A clean-water advocate took an Earth Day swim in the polluted Gowanus Canal, a federal Superfund site."

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

"ExxonMobil Corp. agreed to pay more than $5 million, including a federal fine, as part of a settlement for the 2013 rupture of a pipeline in Arkansas that was carrying oil sands from Canada."

"Five years after the largest oil spill in U.S. history spewed millions of gallons of crude into the Gulf of Mexico, many Louisiana oystermen are fearful that a once-bountiful population of the mollusks may never recover."