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 the Associated Press:
Environmentalists are pressing Beacon Hill lawmakers to back a bill that would ban the practice of fracking in Massachusetts.
Fracking refers to the natural gas drilling technique known as hydraulic fracturing that pumps pressurized water mixed with sand and chemicals into well holes to crack open fissures in the ground.
Many environmental groups oppose the process saying it can lead to contaminated drinking water.
The group Environment Massachusetts delivered what it said where the signatures of 11,000 Massachusetts residents to lawmakers supporting a bill that would block the practice in the state.
Rep. Denise Provost is one of the sponsors of the bill. The Somerville Democrat said she's concerned about what she called the toxic waste generated by fracking.
Vermont last year became the first state to ban fracking.