At the United Nations Conference on Environment and Development (UNCED), the Earth Summit, which was held in 1992 in Rio de Janeiro, Brazil, leaders from 178 nations met to discuss the state of the environment and identify courses of action to ensure the Earth's survival.

The proposals put forward at the Conference were issued as Agenda 21, a plan of action which proposes a path towards a sustainable future for both humans and all other life forms on Earth. Agenda 21 offers a message of hope, inviting us to plan and to take action now in order to safeguard the legacy we hope to pass on to future generations. Ensuring a sustainable future will require, from all of us, a greater awareness of the problems we face, as well as the determination to find solutions.