To be clear, this is NOT a data center, this is rare earth metal extraction and manufacturing, particularly silicon. I'd actually argue that's worse because a single data center can cause a lot of harm but it can be shut down. Meanwhile, rare earth extraction could cause lasting damage including pollution of water, air and land, and habitat destruction.
The original signatories were Australia, Israel, Japan, South Korea, Singapore, the UK and of course the United States.
https://en.wikipedia.org/wiki/Pax_Silica
Currently the Wikipedia has a controversies page, though if that gets taken out it should still be in the edit history.