Well it's complicated. It seems a good idea to get more oil or gas out of existing wells instead of having to drill in ever more inaccessible (and sometimes quite beautiful*) places. On the other hand some of the chemicals they are using to do it don't seem to be good for the environment, particularly in places where the water supply is artesian wells. The documentary movie "Gasland" gives one side of the argument. The constant ads on our telly just now saying fracking is going to bring us (in the USA) a Golden Age of energy independence give the other side.
* I don't mean Lybster
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