What is sustainable development?

sustainable development is economic development that is conducted without depletion of natural resources.

Sustainable development contain two key concepts:

The concept of needs, in particular the essential needs of the world's poor, to which overriding priority should be given

The idea of limitations imposed by the state of technology and social organization on the environment's ability to meet present and future needs.

In short Sustainable Development is the economic development that is conducted without depletion of natural resources.