most servers in the data centres use air cooling on the CPU/GPU/Drives etc, it blows cool air over the server which heats it up

You then have the HVAC systems which cool down the whole data centre

They are now moving towards a liquid cooled PC style of cooling where the cooling is built into the rack and doesn’t pull water from the mains

https://datacentremagazine.com/articles/microsoft-unveils-zero-water-cooling-for-ai-data-centres

There is a lot of attention being paid to make sure we don’t run out of water, but unfortunately that doesn’t generate anxiety clicks