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Unsafe for
human health
Sewage
pipes not
separated
from storm
drains
Safe for
human
health
Threat to
aquaculture,
tourism,
fishery and
industry
No water
treatment
Water
pollution
Sewage
discharges to
surface water
Groundwater
pollution
Unsafe for riverine
ecosystems and
for human use
Local
farmland
Access to clean drinking water
Access to basic sanitation
Present situation, safe drinking
water and basic sanitation
Percentage of population
Developed
countries
Latin America
and the Caribbean
North Africa,
the Middle East
and Russia
Sub-Saharan
Africa
South Asia and
East Asia Pacific
Average number of deaths
per year, 1980–2015
x 1,000
0
20
40
60
80
100%
Source: CRED, WHO
Source: WHO, Unicef
75Conflicts
63Natural
disasters
780Unsafe water
Challenges
A century ago, the dominant
flow for nutrients was their
reuse in agriculture. Today,
nutrients mostly end up in
surface water. The increase in
nutrient emissions may lead to
algal blooms and deoxygenation,
affecting the ecological quality
as well as economic activities in
these waters, such as fisheries,
aquaculture and tourism.
Lack of access to clean drinking
water and lack of sanitation are
two of the major causes of human
illness and mortality. In combin-
ation, their impact leads to almost
800,000 human deaths, annually,
in low- and middle-income
countries. This is far more than
the number of annual casualties
from flooding, drought, or violent
conflict.
One in eight people in the world
have no access to clean drinking
water and almost one in three
lack basic sanitation facilities
Although access to clean drinking
water and sanitation facilities has
improved over the last decades,
large differences remain between
world regions. For instance,
although since 1990, 2.6 billion
people have gained access to
clean drinking water, today 660
million people are still without,
especially in Sub-Saharan Africa.
In addition, at least 1.8 billion
people around the world use
a drinking water source that is
faecally contaminated. Improving
sanitation in Asian and African
countries is one of the major
challenges, for the coming decades.
In Africa, diseases such as diarrhoea
are mainly caused by contaminated
drinking water and poor sanitation,
and are responsible for over 10% of
infant mortality, which is 25times
higher than in developed countries.
Although major improvements have been made, globally,
one in eight people still lack access to clean drinking water,
and one in three lack adequate sanitation facilities.
DIRTY WATER: A THREAT
TO HUMAN HEALTH
THE GEOGRAPHY OF FUTURE WATER CHALLENGES 2 MAPPING HOTSPOTS 3938
THE GEOGRAPHY OF
FUTURE WATER CHALLENGES

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