State officials have determined that at least 12 earthquakes that occurred in Ohio last December were caused by the injection of brine into hydraulic fracturing disposal wells. As a result of its findings [pdf], the state has established the nation's "toughest regulations" for the fracking disposal wells.
Brine is a toxic by-product . . . → Read More: DeSmogBlog: Fracking: Ohio Establishes Tough Regulations After Disposal Wells Cause 12 Earthquakes