I like the core idea a lot, and I find the idea of the mechanics compelling (deckbuilding games are usually about building an engine, so having the "engine" being a sustainable world just makes sense). My major concern is that the scope seems AMBITIOUS. As far as I can tell you want the game to be able to span from before humans even exist to the modern era of solar power and oil rigs, and there doesn't seem to be a clear stopping point / end goal. I think meeting at least twice a week would be good if possible, and I would highly recommend figuring out your scope and aggressively whittling down your ideas as we head into the development phase. You can always re-introduce ideas if you end up having time.