We already have cases of fracking in Ohio causing earthquakes. When the earth shifts, the underground rock can move enough to release the gases/chemicals/whatever they put down the wells. And the casing is only as good as the manufacturer. We also have incidents of subpar casing causing leaks. Since we don’t know what they’re using, we cannot prepare for consequences. Maybe our two Ms-es would like to live near Youngstown, where a fracking waste disposal operator has been shut down and is on trial for dumping waste into the water supply. This industry will not police its own, will not tell us what they’re using, anmd “assures” us it’s safe.