Climate risks reach Singapore through its coasts, streets, ecosystems and overseas supplies.
Rising sea level gives tides and storm surges a higher starting point, increasing coastal flood risk. Heavy rain causes inland floods when water cannot drain quickly enough. These are different routes to flooding, so a sea wall alone cannot solve every drainage problem.
Global warming adds to local urban heat. Buildings and roads store heat; reduced vegetation and human activity also make urban areas warmer than their surroundings. This urban heat island effect is distinct from global warming. Hot, humid air makes it harder for people to lose body heat. Temperature and rain can also change mosquito habitats and disease transmission, alongside factors such as breeding-site control.
Heat and changing conditions can damage sensitive species and habitats. Dry spells reduce rain-fed water supply, while intense rain can affect water quality. Overseas crop losses and disrupted transport may reduce imported food supplies or raise prices. Singapore's climate risk therefore extends beyond events on its own island.
Step by step
Climate changes
Sea level, heat and rainfall patterns change.
Local conditions matter
Elevation, drains, urban surfaces, ecosystems and trade links shape the effects.
People face different risks
Shade, cooling, health and reliable supplies affect the ability to cope.
Worked example: Two people in the same city
An outdoor worker and someone in a cooled building experience different heat exposure during the same weather. Age, workload, health, shade and opportunities for rest can also change vulnerability. A city-wide temperature figure alone cannot describe every person's risk.
Watch out for this
Climate change creates the urban heat island effect.
Urban development produces a local heat island. Global warming can raise the background temperature on which that local effect is added.
Check your understanding
Which distinction is correct?
- Urban heat islands and global warming are identical processes.
- Global warming can intensify heat experienced in an existing urban heat island.
- A sea wall prevents every kind of flood in a city.