you've hit the silent nail on the head.
The complaints about data centers are really complaints against ai and its encroachment into people's lives (more specifically, they fear for their jobs due to ai).
If people truly cared so much about the environment, where were their complaints about climate change and such?
It's the same with the recent hype about how AI going rogue or is gonna kill us all if we reach AGI.
None of these are real threats, compared to the threat of climate change, where there's a real threat of crop failures enmass due to consistently extreme weather, and coastal erosion sinking cities, etc. We'll hit this before we reach AGI no doubt.