The Montreal ______ is an international agreement aimed at phasing out ozone-destroying substances.

The Montreal Protocol is an international treaty that was established to address the depletion of the ozone layer caused by chlorofluorocarbons (CFCs) and other ozone-depleting substances. This protocol is significant because it represents a collective global effort to reduce and eventually eliminate the use of these harmful substances, thus allowing for the recovery of the ozone layer. The agreement is considered a landmark achievement in environmental diplomacy, as it demonstrates how countries can unite to tackle a common environmental issue.

While the terms "Agreement," "Summit," and "Covenant" can refer to various types of international accords, in this context, "Protocol" is the most accurate designation. It specifically highlights the structured nature of the treaty and the commitments made by the signatory countries to phase out substances that contribute to ozone depletion.