Why not play the million video games that already have been released? Why not read the million books that have been released? Watch the TV shows and movies that have already been released?
When you are done consuming all of them, you will be dead multiple times over.
To save the planet? Meh
To your point directly, it is totally possible to "live" in a single location. Nobody said anything about being sedentary. There are many ways to make oneself useful every day. But if you live in New Mexico, maybe fresh salmon from the grocery store isn't an option society needs. These things are nice, not necessary, and it wasn't that long ago that we all got along fine without all the options required to feed every hedonistic impulse we have.
On mobile. Writing is probably fucked up. Sue me.