Alright, then. I see where you're goin' with this. Yea, you're right. Luna wouldn't provide anything in terms of energy or industry essential resources. Earth should be fine for quite some time, as long as we learn to properly utilize it's geothermal energy sources. Mars, most certainly, doesn't have anywhere near as much potential for geothermal energy production. Perhaps hydrothermal, though 🤔. Depends on the size of the subsurface water pockets that, most likely, lie there. You're on to something there. No doubt. Although, a long-lasting colonial population on Mars doesn't seem possible, imo.