I'm surprised how few garbage disposals you built, I have about 30 for my city of 100,000 and have the impression that I will need more soon, but maybe my feeling is wrong. Or you just didnt have it on video. Cool/ or annoying how your capital grew around the rocks, I try to make mine grow around, always moving the supply centers outwards. Little trick: From 100,000 inhabitants, the city only needs oxygen and food in order not to shrink. From that point onwards, aluminum and steel ingots could be extracted from the city's garbage without having to transport them back in the form of high-tech parts, the same applies to the connecting materials or the purple goods, which are then unlocked.