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Through
the
changes＇in
the
ways
Of
making
a
living
in
a
family
over
several
gen,erations,
man
has
been
warned
against
waste
of
natural
resources
and
读书人作文网()
emphasizing
the
urgent
need
to
preserve
these
resources.
Ever
since
man
appeared
on
the
earth,
man＇s
survival
has
been
heavily
relied
on
nature.
Almost
everything
we
use
in
our
everyday
life
comes
fromm＇notate,
ranging
from
the
food
we
eat,
the
water
we
drink,
to
the
wood
which
is
tm＇ned
into
furniture.With
the
development
of
technology
and
population
growth,
the
amount
and
range
of
materials
used
has
increased
at
an
alarming
rate.However,
natural
resources
are
not
inexhaustible.
Some
reserves
are
already
on
the
brink
of
exhaustion
and
there
is
no
hope
of
replacing
them.
The
widespread
water
shortage
is
an
example
in
point.
If
man
continued
to
squander
natural
resources
with
no
thought
for
the
future,
the
later
generations
would
be
in
danger.
It
is
up
to
us
to
take
effective
measures
before
the
situation
gets
out
of
hand.
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