The energy and resources to build it would be the same regardless where it would be.

The energy and resources to supply all of the new people with stuff are the same regardless where it would be.

Sustain a bull means practices that could continue generation after generation, after the oil is long gone.

Efficient means careful ways to use up the last of the fossil fuels.

At best, this project might be sustain a bull, but even that is probably exaggerated.