Summary:

- The article discusses the importance of the Montreal Protocol, an international agreement signed in 1987 to protect the Earth's ozone layer by phasing out the production and use of ozone-depleting substances.

- It highlights how the protocol has been successful in reducing the levels of these harmful substances in the atmosphere, leading to the gradual healing of the ozone layer.

- The article emphasizes the need for continued global cooperation and action to address environmental challenges, using the success of the Montreal Protocol as an example of how science can drive meaningful change on a global scale.