As the world has entered into the menace of global warming and with the emission of harmful Green House gases

As the world has entered into the menace of global warming and with the emission of harmful Green House gases, the natural layer of ozone, that protects the living species from the ultraviolet rays of the sun, appears to be depleted enormously with the passage of time. The man-made factors caused such global crises, and there felt a need to address it by proposing a universal solution of it. The Montreal Protocol on Substances that Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. It was agreed on 16 September 1987 and entered into force on 1 January 1989. The two ozone treaties have been ratified by 197 parties, making them the first universally ratified treaties in United Nations history.
The Montreal protocol mainly focuses on the phase-out management of three groups of harmful greenhouse gases in which time limit has given for their complete management. The three main phases include: