Have a project in school where i have to create a civilization that will last. What is a major thing i can do to help it not colapse? Sofar we are a peaceful people that live in trees.
Ensure sustainable use of resources. That has -always- been the source of civilization collapse. Romans, Greeks, Sumerians all died off from depletion of farmland. Mongols had no sustainable anything.
Chinese and Indians use land efficiently... and remain today.