are often dispersed across cities or concentrated in industrial
areas or waste sites. Lead- based paint used on roads and highways
and on buildings is one such example of a widely dispersed pollutant
that found its way into soil. But humans also bury tremendous amounts
of waste in the ground at municipal and industrial dumps. These
materials can severely contaminate soils. Even such commonplace
items like gasoline storage tanks at filling stations have the potential
to cause serious contamination. When this problem was discovered
a decade ago, hundreds of storage tanks had to be removed and replaced
with safer containers. The most extreme cases of industrial pollution,
as at Love Canal in Buffalo, New York, have forced the abandonment.
water and flood drains carry waste to Boulder Creek
Streaming Quicktime Movie (click image to play):
Another impact of urbanization is pollution.