What is Sustainability of development?

What is Sustainability of development?
Today i will give the full explaination of this question so economic development in the developed countries and developing countries, has been attained at the cost of natural resource and environment. Development takes place through exploitation of renewable and non renewable resources. For example, excessive use of mining of iron, gold, silver or coal and extraction of crude oil led to deplection of stock of these resources. Smoke and other poisonous gases being released from factories led to environmental pollution. Problems of air and water pollution are affecting the lives of the people and will affect the lives of the future generations also. The fear of exhausting the non-renewable resources and degradation of the environment warns that the current pattern of the development is not sustainable.