It’s a good idea at the wrong time. Our species priority should be managing ecological overshoot. For example, tackling our Planetary Boundaries so humanity can de risk human civilizational collapse and possible extinction.

Space should come after we’ve solved for sustainability. Edit: I should also note that true sustainability also advances our capabilities in space as for any meaningful human missions, you’ll need to bring your sustainable environment with you wherever you go. It will need it’s own circular economy and ecology and the technology that goes with it.