What is the main reason for the positive impact of the Montreal Protocol?

The main reason for the positive impact of the Montreal Protocol is its successful action in banning most chlorofluorocarbon (CFC) production in developed countries. CFCs are substances that were commonly used in aerosol sprays, refrigeration, and air conditioning. They were found to be significant contributors to the depletion of the ozone layer, which protects the Earth from harmful ultraviolet radiation.

The protocol, established in 1987, marked a critical milestone in international environmental policy because it laid out a framework for phasing out the use of ozone-depleting substances across participating nations. Its implementation has resulted in a substantial reduction in atmospheric levels of CFCs. The positive outcome of this initiative has been a gradual recovery of the ozone layer, which is vital for protecting ecosystems and human health from increased UV radiation.

While reducing carbon emissions, eliminating lead from petrol, and decreasing water pollution are important environmental issues, they are not the primary impacts attributed to the Montreal Protocol. The specific focus of the protocol was to address ozone depletion rather than these other environmental concerns.