Sea Level Rise — Prelims Strategy
Prelims Strategy
For Prelims, a strong grasp of the fundamental science and key facts related to sea level rise is essential. Begin by clearly understanding the two primary mechanisms: thermal expansion and the melting of land-based ice (glaciers and ice sheets).
Differentiate these from the melting of floating sea ice. Memorize the latest global mean sea level rise rates (e.g., 3.7 mm/year for 2006-2018) and the general range of IPCC projections for 2050 and 2100 under different emission scenarios.
Pay close attention to India-specific vulnerabilities, identifying key coastal states, cities (Mumbai, Chennai, Kochi), and ecological zones (Sundarbans) that are most at risk. Understand the implications of saltwater intrusion, coastal erosion, and storm surge amplification.
Familiarize yourself with relevant Indian policies like the Coastal Regulation Zone (CRZ) notifications and the National Action Plan on Climate Change (NAPCC), knowing their core objectives. Practice MCQs that test conceptual clarity, factual recall, and the ability to identify correct statements regarding impacts and causes.
Be wary of trap options that confuse land ice with sea ice melt or misrepresent the primary drivers. Vyyuha's quick recall mnemonic 'RISE Framework' can be particularly helpful for rapid revision of key concepts.