The
polar
bear
is
the
____________________
animal
that
has
been
classified
as
endangered
due
primarily
to
global
warming
.
Global
warming
is
____________________
by
carbon
dioxide
and
other
____________________
gases
that
____________________
trapped
in
the
atmosphere
.
Heating
homes
,
driving
cars
,
and
____________________
garbage
all
require
fossil
fuels
that
lead
to
global
____________________
.
The
polar
bear's
habitat
____________________
more
vulnerable
to
global
warming
than
____________________
other
species
.
Polar
bears
live
____________________
on
the
sea
ice
in
the
Arctic
.
This
is
where
they
____________________
for
fish
and
build
____________________
fat
reserves
.
When
the
ice
____________________
many
polar
bears
move
to
land
and
live
off
their
____________________
fat
.
In
the
Arctic
,
global
warming
is
causing
the
ice
to
melt
slightly
earlier
and
form
slightly
later
.
This
results
in
a
shorter
____________________
season
for
the
polar
bear
.
Some
risk
their
lives
to
find
ice
.
If
they
have
to
swim
too
far
they
will
drown
from
exhaustion
____________________
hunger
.
The
World
Wildlife
Fund
estimates
that
25%
of
the
Arctic
sea
ice
has
disappeared
in
the
past
30
____________________
.
It
is
important
that
animals
____________________
as
the
polar
bear
make
it
onto
the
endangered
species
list
.
Once
they
are
on
the
list
there
are
laws
that
____________________
these
animals
from
being
hunted
for
____________________
or
sport
.
Agencies
also
receive
money
and
tools
to
protect
the
habitat
and
recover
the
species
.
The
goal
of
____________________
the
animal
from
the
list
is
often
____________________
.
Since
the
Endangered
Species
Act
was
introduced
in
the
US
in
1973
,
many
species
have
been
taken
off
the
list
due
to
increased
____________________
.
In
fact
,
it
is
rare
for
a
species
to
go
____________________
after
they
make
the
list
.
Sadly
many
species
do
go
extinct
while
waiting
for
____________________
.
