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To expand on this. There's ~321M cubic MILES of water in the ocean.

Total US water usage is about 2 cubic miles per week - which is not even a 100 millionth of the water in the ocean.

I imagine similar things were said about burning oil and gas at one time.

That aside I think the more pressing concern is the local environment, turning the area around your station into a brackish dead zone.

It is in the water cycle anyway, so yes globally really makes no difference. But the localized levels of salinity certainly can be effected and be detrimental.