Ozone Layer Depletion — Prelims Strategy
Prelims Strategy
For Prelims, a strong foundation in factual details and conceptual clarity is paramount. Begin by thoroughly understanding the basic science: the difference between stratospheric and tropospheric ozone, the natural Chapman cycle, and the chemical reactions involved in ozone destruction by chlorine and bromine radicals.
Memorize the key ozone-depleting substances (CFCs, HCFCs, halons, methyl bromide) and their primary uses. Focus heavily on the international legal framework: the Vienna Convention (framework) versus the Montreal Protocol (binding targets).
Crucially, know the major amendments to the Montreal Protocol – London, Copenhagen, and especially Kigali. For Kigali, remember it targets HFCs (not ODS but GHGs) and its climate change implications. Pay attention to India's status as an Article 5 Party and its compliance achievements.
Understand the unique factors contributing to the Antarctic ozone hole: extremely cold temperatures, Polar Stratospheric Clouds (PSCs), and the polar vortex. Keep abreast of recent developments, such as the 2023 WMO ozone assessment report and its recovery projections, as these are frequently tested current affairs.
Practice MCQs that test specific provisions, timelines, and the interconnections between ozone depletion and climate change. Create flashcards for ODS, their ODPs, and the key features of each amendment.