Geoscience Reference
In-Depth Information
Figure 7.1 The urban
system, illustrating the
interactions between the
city, the human
environment, and the
physical environment. (From
Bridgman et al.
1995
)
30
Figure 7.2 Populations of
the megacities (greater than
10 million people) of the
world. The majority exist in
South and East Asia.
(Modified from
www.unep.org)
25
20
15
10
5
0
City
With their increasing populations, wide diversities, and important problems, it
is little wonder that urban environments are of such concern to global, regional,
and local decision makers. Cities have a very important role in regional climate,
affecting temperature, wind, and precipitation. Urban impacts on global climate
are less clear, although they contribute to increased cloud cover frequency, are a
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