Discuss the purpose of Rio de Janeiro Earth Summit and Agenda 21

Discuss the purpose of Rio de Janeiro Earth Summit and Agenda 21.
or
What was the purpose of the Earth Summit held in Rio de Janeiro Brazil in 1992? What are the main provisions of Agenda 21 signed at this Summit?

The first United Nations Conference on Environment and Development (UNCED) was held in Rio de Janeiro, Brazil in 1992 to formulate an Agenda to promote sustainable development.
This convention endorsed the Global Forest Principles and adopted ‘Agenda 21’ for achieving sustainable development in the 21st century.
The objectives of Agenda 21 are the alleviation of poverty, hunger, sickness and illiteracy worldwide while halting the deterioration of ecosystems which sustain life.
These are sub-divided into four sections
(i) Examining the underlying human factors and problems of development.
(ii) Conservation and Management of Resources for Development.
(iii) The social partnerships necessary between governments and major groups of the community if sustainable development is to be a reality.
(iv) Means of implementation.