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Who else foresees environmental problems with this later down the line?

Under the sea, Microsoft tests a datacenter that’s quick to deploy, could provide internet connectivity for years - Stories

https://news.microsoft.com/features/under-the-sea-microsoft-tests-a-datacenter-thats-quick-to-deploy-could-provide-internet-connectivity-for-years/

Microsoft are looking at putting datacenters under the ocean, which sounds like a really good idea to cool them but I can’t help but think a couple decades from now it’s going to start causing us problems

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towerful

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I can tell you that big data centers likely have a 4 year hardware cycle, where it is all under warranty and service contract.
After which, it gets sold to refurbishers who refurb it and resell it. Or the datacenter may repurpose it for labs, OOB hardware, or donate it to schools.

A lot of smaller companies don't need the latest and greatest, and are quite happy running old 2nd hand hardware.

Even after they are done with it, there are plenty of hobbyists that will buy it. I have a couple 8 year old servers that run absolutely fine for what I need.

Old servers are also kept around as parts for companies that refuse to update old hardware (and will just keep buying spares, or like-for-like replacements).
The last step is ewaste, where the good stuff gets boiled in acid to extract the gold, or whatever they do.

The only things that are generally destroyed during hardware cycles are the storage, and that's normally for compliance reasons.