While the three "worlds" of Individual, Fossil Fuel-Driven Growth, of Citizen-Driven, Sustainable Growth and of Fast, Globally-Driven Growth all present common risks, such as those related to the environment, their magnitude varies substantially between scenarios. The performance of each of these scenarios is compared in order to facilitate the identification of strategies to manage risks and avail of future opportunities, which will be discussed in Chapter 3. Generally, food and nutrition security is defined around four pillars or dimensions, including the availability, stability, access and utilisation by the body: "Food security exists when all people, at all times, have physical, social and economic access to sufficient, safe and nutritious food to meet their dietary needs and food preferences for an active and healthy life" (FAO, 1996, 2009).