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.
Research in Pennsylvania suggests that fracking in the state is reducing air pollution by a significant amount, writes James Conca in The Breakthrough (and originally published in Forbes).
Conca writes: "So is fracking making things worse? Or better? And by better, does that mean just less worse, or is it really better, like going down the path that actually will protect the environment in the long-run?
"Recent studies by PA DEP have shed some light on these questions. The studies show that the new builds in gas-fired power plants and the associated surge in fracking over the last few years have dramatically reduced emissions across the State, emissions of every sort – deadly particulates, heavy metals, and the NOx and SOx which are those nasty components of smog that also cause acid rain and a lot of health problems.
"Just last Tuesday, PA DEP released its latest report on emissions from unconventional shale gas extraction operations in the state (PA DEP emission study)."
You can read Conca's entire column here.