Umm, hate to break it to you, but by the time you load up an open weights model, the environmental externality has already happened
However, I never asked for LLMs nor did my consumer nor professional behavior send market signals that I would use them. They were thrust upon me apropos of nothing.
Now that I find them useful, the least I can do is stop making the problem worse.
Why buy a personal EV with 600 mile range that sits idle 95% of the time when you can take a bus (aka the cloud) that maximizes the resource utilization?