Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
From Susan Phillips of Pennsylvania NPR's StateImpact:
The Clean Air Council has appealed a permit issued by the Pennsylvania Department of Environmental Protection to Angelina Gathering Company for a compressor station expansion in Herrick Township, Bradford County.
Compressor stations push natural gas through pipelines toward processing plants.
In addition to emissions from the compressor station, nearby natural gas operations also create air pollution.
The lawsuit, filed with the Pennsylvania Environmental Hearing Board, says the DEP should have aggregated nearby sources of air pollution, which include nine wells that serve the Greenzweig Compressor Station.
If the state combined emissions from the nine wells, and the compressor station, more stringent environmental rules would apply. These include greater pollution limits, record keeping, monitoring and public input.
The lawsuit also says state regulators miscalculated emissions and failed to respond to public comments.