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:
More than 150 environmental groups are asking California coastal regulators to halt offshore fracking, saying the practice violates state law.
Wetsuit-clad demonstrators holding surfboards submitted the letter to the California Coastal Commission on Thursday before its meeting in San Francisco.
Fracking involves pumping huge amounts of water, sand and chemicals into deep rock formations or old wells to release oil or natural gas.
While the state oversees oil wells, there have not been specific rules governing fracking.
Recent reports by The Associated Press documented hundreds of hydraulic fracturing jobs in the Santa Barbara Channel, the site of a disastrous 1969 oil spill that spurred the modern environmental movement, and other nearshore waters.
The coastal commission has launched an investigation into the extent of fracking in federal and state waters.