Which is a key characteristic of sustainable cities?

A key characteristic of sustainable cities is the presence of effective public transportation systems that reduce car dependence. This is vital because transportation is one of the significant contributors to urban pollution and greenhouse gas emissions. By promoting efficient public transport, sustainable cities can improve air quality, decrease traffic congestion, and lower overall carbon footprints.

Effective public transportation systems encourage people to rely less on personal vehicles, leading to reduced road traffic and lower emissions. They also improve accessibility and equity, allowing residents, including those without cars, to access essential services, work, and recreational facilities easily. This interconnectedness fosters healthier communities and promotes social interaction.

In contrast, high levels of pollution and urban sprawl would detract from the sustainability goals of a city, making it less livable and more environmentally harmful. Similarly, pursuing rapid economic growth without consideration for environmental impact can lead to depletion of resources and degradation of the natural environment, which is counterproductive to sustainability. Hence, effective public transportation systems are pivotal in shaping a sustainable urban environment.