Huge fan of Valclav Smil’s work. Note that the significant amount of water required to frack those wells is in the order of 1 million galls or more. Both sides of that is impacting the Edwards Aquifer[1]. Wastewater from wells is finally being treated, but it doesn’t seem to be a widespread practice, yet. It’s also possible that production declines after each subsequent refracking process.

—- 1 - https://en.m.wikipedia.org/wiki/Edwards_Aquifer