Is that an honest question?
It's used to extract a fossil fuel. That should answer your question in case you know the definition of "sustainable".
https://www.youtube.com/watch?v=SMsLEqjVbgA
And is known that had caused earthquakes in dense populated areas from Mediterranean coasts (see Castor Project) or US, so is a danger for infrastructures also
https://www.youtube.com/watch?v=F6PHVhjaNRI
And there is also this thing that I don't even have words for it.
https://www.youtube.com/watch?v=NvJAKVnK4qM
All for a source of gas that could last one or two years in many cases, and then is exhausted and left contaminated. But is heavily subsidised by taxes in many cases
Fracking is greedy monkey stuff. Is a nonsense from any human point of view in any historical period (past or future) to pay for deliberately allowing a few people poison your own drink water.