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= Environment: =
 * The surroundings or conditions in which a person, animal, or plant lives or operates
 * The setting or conditions in which a particular activity is carried on
 * The overall structure within which a user, computer, or program operates
 * The natural world, as a whole or in a particular geographical area, esp. as affected by human activity

= Sustainability: =
 * the ability to sustain something
 * ( ecology ) a means of configuring [|civilization] and human activity so that society, its members and its economies are able to meet their needs and express their greatest potential in the present, while preserving [|biodiversity] and natural [|ecosystems], planning and acting for the ability to maintain these ideals for future generations