Sustainability involves learning to make decisions that provide for the needs of the world's current population without damaging the ability of future generations to provide for themselves. Sustainability encompasses the intertwined ideals of viable economies, equity and justice, and ecological integrity.
The imperative of sustainability is driven by our recognition that the ways humans are using the earth’s resources now is not sustainable: human needs are not now being met and all the earth’s ecosystems are degrading. The need for sustainable solutions is made more tangible through the exploration of issues such as global warming and climate change, sustainable agriculture and food security, energy use, control and prevention of human disease, water quantity and quality, and pollution and toxins in the environment.