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Source: PBL
Cities and population
density, 2050
Cities 2010
Cities 2050
Inhabitants
(millions)
10
20
30
Population density
(number of people
per 30'' grid cell)
1–100
101–500
501–1,000
> 1,000
Source: PBL
Kinshasa will
grow from
7.8 million
to 28.3 million
inhabitants
By 2050 Mumbai
will be the biggest
city (31.6 million)
0 2,0002,000 4,0004,000 6,000
Delta
Coast
Drylands
Global
UrbanRural Millions
Strong population
growth in urban
areas
In deltas and drylands
the urban population
will almost double
2050
2010
Change in urban and
rural populations,
per type of area,
2010–2050
Fast urban growth,
more than doubling
city sizes, occurs
especially in the
developing countries
of East and South
Asia and Sub-Saharan
Africa.
URBANISATION CHANGES
GLOBAL VULNERABILITY
In the urbanising world, cities will increasingly become
centres of population growth and economic development.
By 2050, 70% of the world population is projected to live
in an urban environment, and the 600 major cities in the
world are expected to provide 60% of global GDP. The
global urban area is expected to expand by more than 70%,
not only in riparian and coastal areas and in deltas, but also
in water-stressed regions, such as drylands. By 2050, 70%
of the global population will be living on 0.5% of the global
land area.
The challenge of inclusive urban
development
Today, about one billion people
are living in urban slums. The
rapidly growing urban population
strongly increases the pressure on
local resources, local environmen-
tal conditions, food availability,
labour opportunities, and public
services. Reducing inequality, inse-
curity and poverty in cities may be
some of the major challenges, on
the path towards 2050.
Because of continued global urbanisation, water-related risks will
increasingly be concentrated in cities.
2120 THE GEOGRAPHY OF FUTURE WATER CHALLENGES 1 SETTING THE SCENE
THE GEOGRAPHY OF
FUTURE WATER CHALLENGES
Cities Flood Risk Hotspots

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