>clean self-power

Just clean and scale the grid.

>closed loop cooling

Just clean and scale your water supply. Remove all the lead that's clearly in there while you are at it.

>noise and light pollution mitigation

NextDC B2 has its phase 2 under construction right now, after the construction workers have all gone home theres no external noise from Phase 1. You can stand outside Equinix SY1 2 or 3 and you cant hear anything but road noise. Its a solved engineering problem. Any deviance from this can be interrogated locally. Its not a pertinent issue with Datacenters as a class.