We
experience
weather
extremities
more
and
more
often
.
A
____________________
climate
is
bringing
about
a
series
of
____________________
changes
.
Polar
icecaps
may
____________________
,
which
would
result
____________________
the
sea
____________________
rising
.
Crop
____________________
are
decreasing
,
which
may
lead
to
____________________
famines
.
It
is
in
all
our
interests
to
prevent
an
ecological
____________________
.
According
to
____________________
,
global
carbon
dioxide
____________________
must
be
cut
by
50%
by
2050
.
One
way
to
do
that
is
through
energy
____________________
.
This
means
developing
____________________
that
use
less
electric
____________________
and
designing
vehicles
with
lower
fuel
____________________
.
We
must
also
make
use
of
____________________
energy
sources
,
like
the
Sun
,
the
wind
and
the
water
.
These
do
not
____________________
carbon
dioxide
into
the
____________________
:
at
the
same
time
they
are
at
our
____________________
in
unlimited
____________________
,
unlike
____________________
fuels
.
