Explain the following: The Montreal Protocol.

The Montreal Protocol: The Montreal Protocol is a protocol to the Vienna Convention for the Protection of the Ozone Layer, an international treaty designed to protect the ozone layer by phasing out the production of numerous substances believed to be responsible for ozone depletion. The treaty was opened for signature on 16 September 1987, and entered into force on 1 January 1989. Due to its widespread adoption and implementation it has been hailed as an example of exceptional international co-operation. Since the Montreal Protocol came into effect, the atmospheric concentrations of the most important chlorofluorocarbons and related chlorinated hydrocarbons have either leveled off or decreased. It is believed that if the international agreement is adhered to, the ozone layer is expected to recover by 2050. A Multilateral Fund for the Implementation of the Montreal Protocol was set up. The main objective of the protocol is to assist developing country parties to the Montreal Protocol whose annual per capita consumption and production of ozone depleting substances (ODS) is less than 0.3 kg to comply with the control measures of the Protocol.