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These
materials
are
designed
to
accompany
the
television
program
'Journey
to
Planet
Earth:
Urban
Explosion'.
As
the
21st
century
dawns,
the
question
is
how
to
balance
economic
growth
with
the
health
of
Earth's
large
metropolitan
cities.
How
do
these
cities
shelter
and
sustain
their
residents
without
destroying
the
delicate
balance
of
the
environment?
The
four
mega-cities
(cities
with
populations
of
...
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This virtual tour takes users across the Golden Gate Bridge. They can walk forwards or backwards, and look up or down and to the left or right. There is also a view from the top of the South Tower.
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