They’re too busy shilling out the next turd to touch the previous.

I think it was the Incans or Mayans that lived in a community of raised huts, shat from above into an area underneath & moved the village over when it started to stink. Then they’d plant seeds in the cleared fertile areas. Simple, efficient & brilliant… until it wasn’t anymore. Disease or Spaniards or a combination of the two, it ended up jungle again with little left to see other than mostly soil-science and foundational markings.