This system of growing crops which have more than two importances to people will not only increase food production, but also increase on their incomes , minimize food scarcity and also minimise on high poverty levels among households.
Director Lindianne Sarno - Food forests mimic nature, are outstanding examples of earth stewardship, and arguably the most natural and sustainable food production method available. They are low-maintenance, produce a huge diversity of food and habitat, and help to regenerate and then maintain the land they are grown on. Here is a 15 minute video by Robert Hart describing how to create one: