Solution:In 1992, more than 100 heads of states met in Rio-de-Janeiro, Brazil for the first International Earth Summit. This summit was convened to address urgent problems of environmental protection and socio-economic development.The assembled leaders signed the convention on climate change and convention of Biodiversity, endorsed the Rio-Declaration and the Forest Principles and adopted Agenda 21 for achieving sustainable development in the 21" century.
The Commission on Sustainable Development (CSD) was created to monitor and report on the implementation of the Earth Summit Agreement. It was agreed that a five-year review of Earth Summit progress would be made in 1997 by the United Nations General Assembly meeting in special session.
Accordingly, a special session of UN General Assembly was held from 23-27 June, 1997 in New York to take stock of how well countries, international organizations and sectors of civil society have responded to the challenge of the Earth Summit.
This meeting was known as Earth Summit +5. Notably, Rio +10 summit was held in Johannesburg in 2002 and Rio +20 was held in Rio-De-Janeiro in 2012.