Campus carbon neutrality one country has not used up all of its allotted emissions, it can sell them to other countries that have gone over their limit. The Montreal Protocol on Substances that Deplete the Ozone Layer is an international agreement that seeks to phase out chemicals that damage the ozone layer. The Montreal protocol was signed in 1987, went into practice in 1989, and was further amended in London in 1990 and in Copenhagen in 1992. The protocol set a quicker timetable for industrialized nations to phase out chemicals than it did for developing nations. For example, developed countries were to phase-out
Montreal Protocol (for example, in the past metered dose inhalers commonly used to treat asthma and chronic obstructive pulmonary disease were exempt) or Halon fire suppression systems used in submarines and aircraft (but not in general industry). The substances in Group I of Annex A are: The provisions of the Protocol include the requirement that the Parties to the Protocol base their future decisions on the current scientific, environmental, technical, and economic information that is assessed through panels drawn from the worldwide expert communities. To provide that input to the decision-making process, advances in understanding on these topics were assessed in 1989,