I don't know if they have even reasearched any detrimental effects (can't find anything to note online) ... but whatever they create has to have an affect on areas surrounding their operations because weather patterns constantly move, even if the consequences are just more rain than normal. That in itself may be deemed a detrimental effect if the area receiving more rain has a wet environment to start with.

IMO nature does a pretty good job of keeping things in balance without the need for man to try and tweak it to suit his requirements.