Sustainability: How can we ensure equality for the six billion citizens of our planet and also ensure that future generations are able to meet their needs? Sustainable development has been defined as “development that meets the needs of the present without compromising the ability of the future to meet its needs” (Our Common Future, 1987). Issues of energy use, pollution prevention, and social equity all have an important role in the movement towards a more sustainable world. Explore these important issues in this interactive web module. Supports Energy Resources Unit Lesson 8.