As environmentalists flag the hydrofracking gas-drilling method as a new threat to the Susquehanna River, some basin residents say authorities have still not fixed an old threat: acid mine drainage.

"Democratic U.S. lawmakers have asked Congressional panels to look into whether Koch, an energy company led by brothers who are powerhouses in conservative politics, will benefit if the Obama administration approves a $7 billion pipeline to bring crude from Canada into the United States."

The ugly truth in Massachusetts is this: after some three decades and $1 billion worth of Superfund cleamup work at scores of toxic sites, nobody knows whether they are still poisoning people.

"The operators of at least 70 facilities that store coal ash , the waste byproduct of coal-burning power plants, have crafted safety plans to better prevent the sort of catastrophic accident that flooded Tennessee properties with toxic sludge three years ago."

"WOODSTOCK, Ill. -- The paving industry closely is watching McHenry County as its officials consider a ban on toxic asphalt sealants commonly used on driveways."

"Environmental regulators on Thursday directed six natural gas drillers to disclose how they dispose of or recycle waste water in Pennsylvania after a recent Chesapeake Energy Corp accident."

"The Obama administration is ordering an ambitious cleanup of the Chicago River, a dramatic step toward improving an urban waterway treated for more than a century as little more than an industrialized sewage canal."

"Lawmakers intensified their shootout over oil yesterday, with House Republicans passing a bill to enhance drilling while Democrats launched a plan to rescind tax breaks for major oil companies and invest in cleaner transportation."

"In the deep waters off Cuba's north coast, a Chinese-built oil rig is due to begin drilling this fall in an area geologists believe may have huge beds of undersea crude."