Earlier quoted context omitted.
"Are you proposing that everyone in SF move to places like the Central Valley (driving up price) and start driving around cars (increasing traffic and pollution)?" I don't know where you came up with this. The OP implied that by moving away from a heavily populated area and working remotely, he was able to afford more space and shorten his commute. You managed to turn no commute into increased pollution and moving to…
He didn't use a car to commute before (I'd hope) given he was in the middle of SF. But now he likely needs one to get to the grocery, take his kids to school, etc even if he's WFH. And he's likely also using more energy at home, too. So yes, more pollution - and if a lot of other people moved there, higher prices too.
Besides this obvious thing, what exactly is your point?