Sustainability means meeting the needs of the present without compromising the ability of future generations to meet their own needs.
There are three pillars of sustainability: environmental, social, and economic. Pictured is the nested approach to sustainability. In this model, we assume that our economy is dependent on society to exist and function, and both the economy and society are dependent on a healthy environment in order to exist. Something is truly sustainable when it is environmentally, socially, AND economically sustainable.