Which of the following best describes how the Montreal Protocol addressed ozone-depleting substances?

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The key idea is that the Montreal Protocol targets the ozone layer by phasing out ozone-depleting substances and requiring safer substitutes. It established legally binding schedules to reduce and ultimately eliminate production and use of chemicals like CFCs and halons, with amendments that speed up or adjust the timelines as science progressed. It also promotes switching to safer alternatives—often starting with transitional substances like HCFCs and moving toward low- or zero-ODS options. This description fits best because it focuses on reducing harmful substances and replacing them with safer choices, rather than promoting more ozone-depleting chemicals, banning all aerosols worldwide, or endorsing chlorine-containing solvents that would worsen ozone depletion.