Here is a short and sweet visual of the difference between a healthy eco-system, teeming with life and a dead and destructive monoculture.
Permaculture genius/ teacher/ writer Geoff Lawton walks between two fields to show us the two.
On the monoculture side he exclaims: "This is not farming. This is a plant factory on the ground. There are no people here. This is not an ecology. This is an insane way to think about how we produce our food, for our health and the planet's health."