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Data centers raise nearby temperatures by up to 4 degrees in Phoenix
(techxplore.com)
This is a most excellent place for technology news and articles.
The guy you are replying to doesn't actually know jack about data centers. Plenty do use closed loop cooling which doesn't involve evaporating water. It's only a minority that use evaporative cooling. Power stations are more likely to use evaporative cooling (hence big towers with steam clouds) than datacenters are. They also use far more cooling water than datacenters do. Both pale in comparison to agriculture and other uses.