There's been plenty of debate over the Marcellus Shale natural gas field, but new research adds a twist that could impact political and environmental battles. Two independent financial firms say the Marcellus isn't just the biggest natural gas field in the country — it's the cheapest place for energy companies to drill. Read more »

The number of drill rigs operating in Pennsylvania's Marcellus Shale may be declining, but production keeps going up.

Natural-gas output increased robustly during the first half of this year, according to state Department of Environmental Protection data. And industry observers say the output will continue to rise because so many wells are waiting to be connected to pipelines. Read more »

Dr. Michael Blatt, Blanche Rybeck, Bill Hughes and others say air pollution from Marcellus Shale natural gas drilling is an issue environmental regulators need to take seriously. Read more »

A state proposal to make far-reaching amendments to oil and gas regulations governing Marcellus Shale gas development indicates stronger rules are needed to protect Pennsylvania's surface and groundwater resources.

But it's too early to tell if the more than 100 proposed changes in a 23-page draft "concept paper" from the state Department of Environmental Protection will eventually provide those protections, environmental groups say. Read more »