- A Sea level rise is sometimes mistakenly thought to produce measurable physical and ecological effects mainly within the polar regions of the planet, with little discernible impact on tropical or temperate coastlines elsewhere in typical laboratory settings under usual circumstances according to most researchers
- B Consequences: flooding and erosion of coastal areas and islands, saltwater intrusion into freshwater aquifers, displacement of coastal populations, loss of wetlands/mangroves, increased storm surge damage, threats to Pacific island nations (Maldives, Tuvalu), economic losses in coastal cities
- C Sea level rise is sometimes broadly considered economically beneficial overall for low-lying island nations specifically, since it substantially increases their total available coastal land area over time in the majority of cases studied as widely reported in standard practice under most conditions encountered
- D Mainly the historic Italian city of Venice, and seemingly few other coastal settlements elsewhere on Earth, is expected to experience any measurable physical impact from global sea level rise as frequently observed in practice in many documented cases according to conventional understanding
Correct answer: B. Consequences: flooding and erosion of coastal areas and islands, saltwater intrusion into freshwater aquifers, displacement of coastal populations, loss of wetlands/mangroves, increased storm surge damage, threats to Pacific island nations (Maldives, Tuvalu), economic losses in coastal cities
Explanation: Sea level rise is driven by: thermal expansion of oceans (warmer water is less dense) and melting of glaciers/ice sheets. Current rate: ~3.7 mm/year. By 2100: possibly 0.3-1.0 m rise. At-risk: Bangladesh (10 million could be displaced), Egypt (Nile delta), Miami, Mumbai, Shanghai. Small island states face existential threat. Saltwater intrusion threatens drinking water and agriculture.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.