Just Sustainability is more refined concept of sustainability.

Just Sustainability is “the egalitarian conception of sustainable development"(Jacobs, 1999:32). It generates an improved definition of sustainable development as “the need to ensure a better quality of life for all, now and into the future, in a just and equitable manner, whilst living within the limits of supporting ecosystems” (Agyeman, et al., 2003:5). This new form of sustainable development prioritizes justice and equity, while maintaining the importance of the environment and the global life support system.

Agyeman, J., Bullard, R. D., and Evans, B. eds., Just Sustainabilities: Development in an Unequal World (London: Earthscan/MIT Press, 2003), 5.

Jacobs, M., "Sustainable Development as a Contested Concept," in A. Dobson, Fairness and Futurity: Essays on Environmental Sustainability and Social Justice (Oxford, UK: Oxford University Press, 1999), 32.