conference held at Rio de Janeiro, Brazil (June 3–14, 1992), to reconcile worldwide economic development with protection of the environment. The Earth Summit was the largest gathering of world leaders in history, with 117 heads of state and representatives of 178 nations in all attending. By means of treaties and other documents signed at the conference, most of the world's nations nominally committed themselves to the pursuit of economic development in ways that would protect the Earth's environment and nonrenewable resources.

The main documents agreed upon at the Earth Summit are as follows. The Convention on Biological Diversity is a binding treaty requiring nations to take inventories of their plants and wild animals and protect their endangered species. The Framework Convention on Climate Change, or Global Warming Convention, is a binding treaty that requires nations to reduce their emission of carbon dioxide, methane, and other “greenhouse” gases thought to be responsible for global warming; the treaty stopped short of setting binding targets for emission reductions, however. The Declaration on Environment and Development, or Rio Declaration, laid down 27 broad, nonbinding principles for environmentally sound development. Agenda 21 outlined global strategies for cleaning up the environment and encouraging environmentally sound development. The Statement of Principles on Forests, aimed at preserving the world's rapidly vanishing tropical rainforests, is a nonbinding statement recommending that nations monitor and assess the impact of development on their forest resources and take steps to limit the damage done to them.

The Earth Summit was hampered by disputes between the wealthy industrialized nations of the North (i.e., western Europe and North America) and the poorer developing countries of the South (i.e., Africa, Latin America, the Middle East, and parts of Asia). In general, the countries of the South were reluctant to hamper their economic growth with the environmental restrictions urged upon them by the North unless they received increased Northern financial aid, which they claimed would help make environmentally sound growth possible.