Q. Where was the World Summit on Sustainable Development (Rio + 10) held?
Answer: Johannesburg
Notes: The World Summit on Sustainable Development, known as Rio+10, was held in Johannesburg, South Africa, from August 26 to September 4, 2002. It marked the 10-year follow-up to the 1992 Earth Summit in Rio de Janeiro, focusing on poverty eradication, sustainable development, and global partnerships. Over 21,000 participants attended, resulting in the Johannesburg Declaration and Plan of Implementation. Davos hosts the World Economic Forum, Nova Scotia had no such summit, and Shanghai hosted other events like APEC in 2001.