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B
Ozone layer depletion
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C
Sustainable development
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D
Food security
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Solution
The correct option is B Ozone layer depletion
The Montreal Protocol is an international environmental agreement with universal ratification to protect the earth’s ozone layer by eliminating use of ozone depleting substances (ODS), which would otherwise allow increased UV radiation to reach the earth, resulting in higher incidence of skin cancers and eye cataracts, more-compromised immune systems, and negative effects on watersheds, agricultural lands and forests.
The treaty evolves over time in light of new scientific, technical and economic developments, and it continues to be amended and adjusted.