The following examples are illustrative of the range of complex and difficult issues around the four pillars of food security (availability, access, utilization and stability), especially if it is assumed that the complex concept of "sustainability" is implicit in the [definition].
(land use & zoning; preservation of agricultural land; land tenure; urban and peri-urban agriculture; large-scale agrarian land acquisitions)
("sustainable" agriculture; organic and conventional methods; seed policies (indigenous seed stock and high-yielding hybrids); genetically-modified crops; agrobiodiversity and intellectual property (plant breeders rights); subsistence farming and large scale agriculture; permaculture; resource use and allocation (e.g. biofuels, water and organic "waste" i.e. compost)
(food sheds, food miles and "eating local;" north-south trade)
(market access; international trade rules; community-supported agriculture; vertically integrated agriculture; commodity markets)
(food preservation; health and safety; food product labelling)
(food deserts, food banks, food cooperatives and municipal food policies; food shortages, famine and food aid)
(fast food; slow food movement; agro-food cultural landscapes)