Image source: toucharcade.com
Analysis
When you are getting close to finishing a level, you will witness the most clever trick this game has up its sleeve: After using buildings to create a sustainable natural biome, you are told to build Silos, buildings that destroy the other buildings around them and rescycle them for materials. Next, you build Loading Docks near rivers or lakes, where a drone boat collects the recycled materials and also destroys the Loading Docks themselves. When you have solved this cleanup puzzle, your mobile base takes to the air, picks up the drone boat, and leaves the area behind, now without any trace of your interference. You can now enjoy looking at your little piece of created nature, and go to the next level.