The world of mankind ...
... superimposed on the natural world.
The world of mankind is the world of people (over 7 billion now, 2016, on a finite world) and the things that they make, which end up as trash or recycled:
Trash: Landfills, burnt, pollution.
Recycled: recycled, reused.
The natural world is the world of the landscape: water, land, atmosphere, plants, animals.