The United Nations Conference on Environment and Development (UNCED), also known as the ‘Earth Summit,’ was held in Rio de Janeiro, Brazil, from 3-14 June 1992. Which of the following combinations of statements about the conference is correct?
i. This global conference was held on the occasion of the 20th anniversary of the first human environment conference held in Stockholm, Sweden.
ii. It focused on the "impact of human socio-economic activities on the environment."
iii. Representatives from 79 countries participated in the conference.

The Correct answer is Option 1. 

Key Points

• This global conference was held on the occasion of the 20th anniversary of the first human environment conference held in Stockholm, Sweden: This statement is correct. The UNCED was indeed held to commemorate the 20th anniversary of the 1972 Stockholm Conference on the Human Environment.
• It focused on the "impact of human socio-economic activities on the environment":  This statement is correct. The Earth Summit aimed to address various environmental issues, including the impact of socio-economic activities on the environment.
• Representatives from 79 countries participated in the conference:  This statement is incorrect. The Earth Summit saw participation from over 170 countries, including many heads of state and government, making it a significant global event.
• The correct combination of statements about the UNCED is Option 1: i & ii.