Most of the DC’s are using open-loop cooling, it’s far cheaper. If they’re using city water, they’re using aquifer supplies If one does use closed-loop cooling, they’re simply using power to pump the cooling. Guess what type of cooling power large plants require? Open loop using aquifer water, which is a miserable idea. Closed loop ends up using surface water by proxy or best case gas turbines which is straight up CO2. The best we could hope to do is put up huge solar arrays + battery, but they’ll never do that, the upfront cost would be enormous. It’s not like any of this is being designed to run responsibly. It’s all the least money they can spend for the max profit.