transhumance

pastoralism

irrigation

involuntary migration

desertification

The practice of pastoralism is decreasing worldwide.

The practice of pastoralism is increasing worldwide.

The practice of pastoralism is increasing in the developed world, but decreasing in the developing world.

The practice of pastoralism is decreasing in the developed world, but increasing in the developing world.

The practice of pastoralism has remained largely unchanged for several hundred years.

Pastoralism

Biotechnology

Domestication

Livestock ranching

Crop rotation

A group of nomadic shepherds tends flocks of goats and sheep in Eastern Africa.

A tribe in Brazil gets most of its subsistence by fishing, hunting and gathering.

A large farm grows a couple of profitable crops.

A small, organic farm grows corn, soybeans and squash together in rows.

barren mountainous terrain

fecund tropical climates

fertile river valleys

temperate communities in the northern hemisphere

temperate communities in the southern hemisphere