Stuff we already depleted

from blog J. Carlos Roldán, | ↗ original
We often worry about resources we’re about to run out of: oil, helium, phosphates… but what about those we’ve already depleted? Throughout history, humanity has exhausted some natural resources and species, some with disruptive consequences and others with none at all. Most of these examples are thought to be depleted, since the world is a large...