What is Sustainability?

1. Meeting the needs of the present without compromising the ability of future generations to meet their own needs.
    -UN World Commission on Environment and Development
2. The long-term health and vitality of economic, ecological, and social systems.
    -Sustainability Communities Network
3. The ability of a system (society, ecosystem, business) to continue functioning into the indefinite future without being forced into decline through exhaustion of key resources.