Understanding Sinking Cities and Climate Change

Which cities are mentioned as being at risk due to climate change and sinking?

• Cairo, Nairobi, Johannesburg, Lagos

• Sydney, Melbourne, Brisbane, Perth

• New York, London, Paris, Tokyo

• Jakarta, Mexico City, Kolkata, Miami

What is a major cause of land subsidence in river deltas?

• Groundwater extraction

• Air pollution

• Deforestation

• Overfishing

How much has Jakarta sunk over the last century?

• More than one meter

• More than two meters

• More than four meters

• More than three meters

What percentage of Jakarta's water supply is provided by the government?

• 20%

• 40%

• 60%

• 80%

Why have scientists underestimated the number of people at risk of coastal flooding?

• They overestimated sea level rise

• They underestimated population growth

• They relied on inaccurate elevation data

• They ignored climate change effects

What is a common issue with satellite sensors used for measuring coastal elevations?

• They are too expensive

• They cannot distinguish rooftops from the ground

• They are not available globally

• They are affected by weather conditions

Which cities have successfully reduced their land subsidence?

• Bangkok and Lagos

• Jakarta and Manila

• Mexico City and Miami

• Tokyo and Shanghai

What measure did Tokyo and Shanghai take to reduce subsidence?

• Built higher sea walls

• Restricted groundwater extraction

• Increased urban green spaces

• Implemented stricter building codes

What is Jakarta's current plan to address its sinking problem?

• Building a giant wall

• Relocating the entire city

• Increasing groundwater extraction

• Planting more trees

What is a key action needed to limit sea level rise this century?

• Expanding urban areas

• Increasing fossil fuel use

• Rapidly cutting emissions

• Building more dams