In 1992, the international community focused on the United Nations Conference on Environment and Development (UNCED) where a plan for sustainable development, Agenda 21, was conceived. "Sustainable development" can be defined as a development approach, which aims at accommodating the needs of present generations without compromising the availability of resources for future generations. Equity among present generations and between this generation and those that follow is a critical component of this concept. It is also important to note that this concept is additionally compelling because it comprises two objectives usually considered to be conflicting, namely development and the protection of the environment. However, in reality it is not easy to achieve sustainable development.