It is thought that during the '''6th millennium BC''' many environments shifted around the world, triggering a change in subsistence patterns. Some historians allege that [[Hunter-gatherers]] in the [[Middle East]] begin to shift towards sedentary [[horticulture]] and early intensive [[agriculture]]. | It is thought that during the '''6th millennium BC''' many environments shifted around the world, triggering a change in subsistence patterns. Some historians allege that [[Hunter-gatherers]] in the [[Middle East]] begin to shift towards sedentary [[horticulture]] and early intensive [[agriculture]]. |