International Institute for Sustainable Development on workshops and international fora that seek to contribute to intergovernmental policy making, and manages a suite of knowledgebases that report on activities that seek to contribute to or implement decisions taken at the intergovernmental policy making level. Intergovernmental processes covered by Earth Negotiations Bulletin include: the Commission on Sustainable Development (CSD); the United Nations Framework Convention on Climate Change (UNFCCC); the Convention on Biological Diversity (CBD); the United Nations Convention to Combat Desertification (UNCCD); the United Nations Forum on Forests; the chemicals conventions (Stockholm, Basel and Rotterdam); the Montreal Protocol on Substances that Deplete the Ozone Layer; the Convention
Ozone depletion to increase dramatically as a result of thinning ozone, as well as harming plants and animals. These concerns led to the adoption of the Montreal Protocol in 1987, which bans the production of CFCs, halons and other ozone-depleting chemicals. The ban came into effect in 1989. Ozone levels stabilized by the mid-1990s and began to recover in the 2000s. Recovery is projected to continue over the next century, and the ozone hole is expected to reach pre-1980 levels by around 2075. The Montreal Protocol is considered the most successful international environmental agreement to date. Three forms (or allotropes) of oxygen