IB ESS 6.4.9 Montreal Protocol success
IB ESS 6.4.9 Montreal Protocol success

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise explaining why Montreal Protocol action is treated as a major success in reducing ozone-depletion risk and avoiding a boundary crossing.
How this is tested
- explain how reducing ODS emissions lowered the risk of crossing an ozone-depletion boundary
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