1. Capable of being utilized without being completely used up or destroyed: For his project at school, Clifford was interested in learning more about sustainable energy resources and sustainable water supplies.
2. Worthy of involving methods that do not completely use up or destroy natural resources: Some farmers employ sustainable agriculture techniques that they can apply and employ for a very long time.
3. Able to last or to continue for a long time: Jack said, "We must have sustainable development and growth in the financial markets."
4. Describing an activity that makes use of the earth's living and physical resources: Such necessary practices include sustainable human actions and their technologies, cultures, and institutions in a way that does not diminish their ability to support future generations.

The consumption of energy should be applied in a manner that emphasizes renewable sources and the judicious use of non-renewable sources.