[crusty old prospector]

No, not that this substance is harmful. Where is your evidence that fracing is screwing up the world's water supplies?

[stormer]

Who said anything about “the world's water supplies”? In this circumstance it appears that there is some issue with the application of the technology associated with this type of extraction. The evidence for this are chemical compounds found in groundwater that would apparently be otherwise absent. I hesitate to point out that technology sometimes fails to operate as intended, and when it does, the consequences can be very serious.