The Montreal Protocol is an international treaty established in 1987 to protect the ozone layer by phasing out the production and consumption of substances that deplete it. This agreement was created in response to scientific evidence showing that chemicals like chlorofluorocarbons (CFCs) were damaging the ozone layer, which shields the Earth from harmful ultraviolet radiation. The protocol has been successful in reducing the use of these harmful substances globally. It has been ratified by nearly all countries, making it one of the most effective environmental agreements. As a result, the ozone layer is gradually recovering, benefiting both the environment and public health.