What is the primary objective of the Montreal Protocol, established in 1987 and reinforced in 1990?

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Achieves the worldwide efficient management of shared natural resourcesDepends on the use of international tradable emission allowancesAddresses the issue of free riders in the provision of public goodsLowers ozone layer damage by phasing out chlorofluorocarbon (CFC) production

Explanation

The Montreal Protocol is an international treaty designed to protect the ozone layer by reducing the production and consumption of ozone-depleting substances, primarily chlorofluorocarbons (CFCs). It does not focus on tradable permits, free rider problems, or general common resource management.