City

:For alternate meanings see city (disambiguation)

Environmental effects

Modern cities are known for creating their own microclimates. This is due to the large clustering of hard surfaces that heat up in sunlight and that channel rainwater into underground ducts. As a result, city weather is often windier and cloudier than the weather in the surrounding countryside. Conversely, because these effects make cities warmer (urban heat shield or urban heat islands) than the surrounding area, tornadoes tend to go around cities. Additionally towns can cause significant downstream weather effects.

Related Topics:
Microclimate - Sunlight - Rainwater - Tornado

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Garbage and sewage are two major problems for cities, as is air pollution coming from internal combustion engines (see public transport). The impact of cities on places elsewhere, be it hinterlands or places far away, is considered in the notion of city footprinting (ecological footprint).

Related Topics:
Garbage - Sewage - Air pollution - Internal combustion engine - Public transport - City footprinting

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