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可持续发展的定义，作为一个发展既满足当代人的需要又不损害后代人满足其自身需要的能力。经济学家普遍接受和支持可持续发展的布伦特兰定义。皮尔斯和比尔也定义了可持续发展作为发展的最后。他们还说，后代人应该享有至少同一水平的经济福祉。它也可以被定义为满足人类的基本需要，同时维持地球生命支持系统的。这是自然与社会可持续发展关系的科学视角。

Sustainable development was defined by (Brundtland, 1987) as a development which meets the needs of the present without compromising the ability of future generations to meet their own need. Economists generally accepted and supported Brundtland definition of sustainable development. Pearce & barbier (blueprint for Sustainable Economy, 2000) also defines sustainable development as development that last. They also said that future generations should be entitled to at least the same level of economic well-being as is currently available to the present generation. It can also be defined as meeting human fundamental needs while preserving the life-support systems of the planet Earth. This is a scientific perspective on the sustainable development relation between nature and society.

The main pillars of sustainable development are:
Economic development
Social development and
Environmental development
The United Nations 2005 World Summit Outcome Document refers the above pillars as the interdependent and mutually reinforcing pillars of sustainable development.

There has been an indigenous controversy over the main pillars of sustainable development through various International Forums such as United Nation Permanent Forum on Indigenous Issues and the Conversion of Biological Diversity that there are four pillars of sustainable development which they called the fourth one , Cultural development. Also, The Universal Declaration on Cultural Diversity (UNESCO, 2001) further detailed the concept by saying that the cultural diversity is as necessary for humankind as biodiversity is for nature.

This basically becomes one of the roots of development understood not simply in terms of economic growth, but also as a means to achieve a more satisfactory intellectual, emotional, moral and spiritual existence. The universal Declaration on Cultural Diversity stated that Cultural diversity is the fourth policy area of sustainable development.

Barriers to achieving sustainable development in developing countries.
Sustainable development has been widely promoted as a holisticconcept which aims or targets to integrate social, economicand cultural policies to ensure high-quality growth.

However, there are barriers combating the implementation of sustainable development in developing countries. These barriers are:

Economic / financial barriers
Social barriers
Political barriers
HIV and Injecting Drug use
Poor monitoring and evaluation system
Institutional barriers
Cultural barriers
Trade barriers
Poverty and disease
Climate change
Economic and financial barriers:
Economists observed that the dominating development model tends to focus on economic growth as precedence rather than people's rights or welfare, and environmental processes and limits. Various contributors supported economic growth coming first in developing countries, especially least-developed countries (LDCs), and concluded that investment in environmental protection should be left to a later stage of development, essentially accepting environmental degradation to meet immediate needs. In other words, there