Explanation
The Earth Summit, also known as the United Nations Conference on Environment and Development (UNCED), was held in:
(D) Rio de Janeiro.
The Earth Summit took place in Rio de Janeiro, Brazil, in 1992. It was a significant international conference that brought together heads of state, government officials, and representatives from various organizations to address pressing environmental and sustainable development issues. The summit resulted in the adoption of several key agreements, including the Rio Declaration on Environment and Development and the Agenda 21 action plan. It was a pivotal event in shaping global environmental policies and promoting sustainable development practices.
