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.
The United States can help China clean up its environment by donating fracking technology to the country, writes Steve LeVine at the online news site Quartz.
LeVine writes: "Elizabeth Muller, who runs a California-based climate change monitoring group called Berkeley Earth, is urging environmentalists to help China help itself by developing its shale gas resources. Because China accounts for much of the world’s future atmospheric increase in heat-trapping gases, Muller argues that it is in everyone’s interests to help wean the country off of coal. And one of the best bets for doing that is the controversial technique of hydraulic fracturing (better known as 'fracking'), says Muller."
The entire Quartz story is here.