The 1992 United Nations Conference on Environment and Development was also known as:

Earth Summit

The correct answer is Option (4) → Earth Summit

The growing focus on environmental issues within the arena of global politics was firmly consolidated at the United Nations Conference on Environment and Development held in Rio de Janeiro, Brazil, in June 1992. This was also called the Earth Summit. The summit was attended by 170 states, thousands of NGOs and many multinational corporations. Five years earlier, the 1987 Brundtland Report, Our Common Future, had warned that traditional patterns of economic growth were not sustainable in the long term, especially in view of the demands of the South for further industrial development.