Final answer:
The Montreal Protocol is an international agreement enacted in 1987 to address the depletion of the ozone layer. It controls the production and emission of harmful chemicals known to damage the ozone layer. The protocol has been successful in reducing the use of these substances and contributing to the recovery of the ozone layer.
Step-by-step explanation:
The Montreal Protocol is an international agreement created to address the depletion of the ozone layer in Earth's atmosphere. It was signed in 1987 by nations all over the world. The protocol controls the production and emission of 96 chemicals known to damage the ozone layer, with the goal of phasing out their use. The Montreal Protocol has been successful in reducing the use of ozone-depleting substances and has led to the recovery of the ozone layer.