Sustainability: The principle of meeting present needs without compromising the ability of future generations to meet their own needs, often through the efficient use of natural resources and the adoption of renewable energy sources.
Ecological Footprint: A measure of the amount of land and water area a human population requires to produce the resources it consumes and to absorb its waste, expressed in terms of a comparable land area.
Environmental Justice: The fair treatment and meaningful involvement of all people regardless of race, color, national origin, or income with respect to the development, implementation, and enforcement of environmental laws, regulations, and policies.