The United Nations Conference on Environment and Development (UNCED) in Rio de Janeiro, June 1992, was a unique event in the annals of international affairs. The ‘Earth Summit’ brought more heads of state and government together than any previous meeting – well over 100, with a 178 governments represented in all. Five separate agreements were signed by most of the participating governments. Thirty thousand people descended upon the city, and the Summit received a blaze of publicity around the world.