____________________
is
an
environmental
concern
for
people
throughout
the
world
.
One
university
study
suggests
that
____________________
in
the
water
,
air
,
and
soil
cause
up
to
40%
of
the
premature
____________________
in
the
world's
population
.
The
majority
of
these
____________________
occur
in
____________________
countries
.
Water
in
many
____________________
countries
is
contaminated
with
toxic
____________________
,
also
known
as
toxins
.
The
World
Health
Organization
(
WHO
)
estimates
that
1
.
1
billion
people
have
little
or
____________________
access
to
____________________
water
.
In
many
of
these
regions
the
water
that
is
used
for
drinking
,
cooking
,
and
washing
is
the
same
water
that
is
used
for
dumping
sewage
and
hazardous
waste
.
Most
developing
countries
cannot
afford
water
treatment
facilities
.
Approximately
80%
of
infectious
diseases
in
the
world
are
caused
by
____________________
water
.
