
Its honestly super complicated but TLDR; To safely cool the systems without ruining hundreds of thousands of dollars of tech they need non salt, non replenish-able water (all water is technically non replenish-able but thats a whole diff convo), ai in 2025 used the same amount of non replenish-able water as the entire bottled water industry and created the same amount of global warming adjacent emissions as all of NYC, gen AI is killing the planet at exponential rates
Contamination mostly, the heat of the systems also creates evaporation loss (which is a reason why they cant closed loop with the already contaminated water). To make the water safe for use/consumption theyd need extremely high energy purification plants that are expensive to make/run so they dont do it. The contaminated water, if released harms ecosystems, but the companys dont wanna fork the major bill to even mildly fix the water so we end up with a bunch of chem filled slop that we cant use