内容正文:
建议用时:5
minutes
难度系数:★★
The
earth
has
warmed
about
half
a
degree
over
the
last
100
years.
It
could
be
getting
warmer
on
its
own,
but
many
scientists
think
that
people
are
making
the
earth
warmer
by
making
a
greenhouse
effect.
The
greenhouse
effect
is
important.
Without
it,
the
earth
would
not
be
warm
enough
for
us
to
live
on.
But
just
a
little
warmer
than
it
is
now
could
cause
problems
for
humans,
plants
and
animals.
Many
of
the
things
we
do
everyday
can
change
the
earths
temperature
by
sending
greenhouse
gases
into
the
air.
We
send
greenhouse
gases
into
the
air
when
we
watch
TV,
turn
on
lights,
dry
hair,
play
video
games,
wash
or
dry
our
clothes
or
drive
cars.
The
rubbish
from
factories
and
homes
also
produces
greenhouse
gases.
Even
a
smal
change
in
temperature
can
affect
our
weather.
This
can
cause
changes
in
the
sea
levels,
the
air,
flooding,
and
our
fresh
water.
The
change
in
the
temperature
can
also
cause
changes
in
the
living
places
for
animals
and
plants,
endangering
many
animals.
Global
warming
is
a
big
problem,
and
every
little
bit
we
do
can
help.
We
can
save
electricity.
We
can
save
energy
in
other
ways
such
as
taking
buses
or
walking
rather
than
driving
cars.
We
can
recycle
to
reduce
the
51
rubbish
and
save
natural
resources
such
as
trees,
oil
and
metals.
We
can
buy
products
that
dont
do
bad
to
the
environment
and
we
can
turn
to
solar
energy.
Remember
that
the
little
bit
that
you
do
wil
bring
a
better
world.
degree度 greenhouse
effect温室效应 t