Sustainability is a measure of the extent to which practices allow for the long-term viability of a
system. It is generally used to refer to the responsible maintenance of socio-ecological systems
in such a way that there is no diminishment of conditions for future generations. 

Sustainability consists of environmental, social, and economic domains. 

Environmental sustainability: the use and management of natural resources that allows
replacement of the resources, and recovery and regeneration of ecosystems. 
This can mean reducing the rate of resource depletion, pollution and conserving biodiversity.

Social sustainability: creating the structures and systems that support human well-being, including health, education, equity, community, and other social factors.
Sustainability in contect: focuses on the survival of societies and their cultures; it may include consideration of the continued use of language, belief, or spiritual practices in a society.

Economic sustainability: creating the economic structures and systems to support production and consumption of goods and services that will support human needs into the future.
In terms of resource use to meet human needs, there is no economic sustainability without environmental  sustainability