[ Episode #14 // Discovering Dirt ]

Published: April 17, 2011, 10:52 p.m.

Though we call it dirt, the soil beneath is the skin of our planet and the breadbasket of our species. Is there a connection between the lifespan of a civilization and the rate at which its topsoil erodes? The agricultural practices of past societies can serve as a stern warning against highly erosive farming and [\u2026]