In
spring
2008
,
the
polar
bear
was
placed
on
the
____________________
____________________
list
.
According
to
the
endangered
Spicies
Act
,
an
endangered
spicies
is
an
animal
that
is
likely
to
face
____________________
in
its
____________________
.
Polar
bears
have
been
categorized
as
a
"
threatened
"
spicies
.
The
ESA
defines
threatened
spicies
as
one
that
is
likely
to
become
"
endangered
"
in
the
foreseeable
future
.
The
polar
bear
is
the
firts
animal
that
has
been
classified
as
endangered
due
primarily
to
____________________
____________________
.
Global
warming
is
caused
by
carbon
dioxide
and
other
greenhouse
gases
that
become
trapped
in
the
atmosphere
.
Heating
homes
,
driving
cars
and
burning
garbage
all
require
fossil
fuels
that
lead
to
global
warming
.
The
polar
bear's
habitat
is
move
____________________
to
global
warming
thatn
other
spicies
.
Polar
bears
live
mainly
on
the
sea
ice
in
the
Artic
.
This
is
where
they
hunt
for
fish
and
build
up
fat
reserves
.
When
the
ice
melts
many
polar
bears
move
to
land
and
live
off
their
stored
fat
.
In
the
Artic
,
global
warming
is
causing
the
ice
to
mest
slightly
earlier
and
form
slightly
later
.
This
results
in
a
shorter
feeding
season
for
the
polar
bear
.
Some
risk
their
lives
to
find
ice
.
If
they
have
to
swim
too
far
they
will
drown
from
exhaustion
ang
hunger
.
The
World
Wildlife
Fund
estimates
that
25%
of
the
Artic
sea
ice
has
disappeared
in
the
past
30
years
.
It
is
not
only
the
polar
bear
tha
is
at
risk
in
the
Artic
.
Every
species
of
plant
,
animal
,
and
insect
there
is
threatened
by
global
Warming
.
Nevertheless
,
____________________
groups
such
as
the
World
Wildlife
Fund
often
study
large
carnivores
in
order
to
assess
the
health
of
an
____________________
.
The
Artic
____________________
____________________
reles
on
the
polar
bear
.
In
addition
,
donations
are
more
commonly
offered
for
the
protection
of
large
animals
such
as
bears
or
elephants
.
People
in
general
are
interested
in
conservation
efforts
that
protect
small
wildlife
,
such
as
plants
or
insects
.
However
,
by
using
donor
money
to
protect
the
habitat
of
the
larger
animals
(
ex
.
____________________
____________________
)
,
entire
ecosystems
can
be
protected
.
It
is
important
that
animals
such
as
the
polar
bear
make
it
onto
the
endanrered
spicies
list
.
Once
they
are
on
the
list
there
are
laws
that
protect
these
animals
from
being
hunted
for
food
or
sport
.
Agencies
also
receive
money
and
tools
to
protect
the
habitat
and
____________________
the
spicies
.
The
goal
of
removing
the
animal
from
the
list
is
often
achievable
.
Since
the
Endangered
Spicies
Act
was
introduced
in
the
US
in
1973
,
many
spicies
have
been
taken
off
the
list
due
to
increased
population
.
In
fact
,
it
is
rare
for
a
spicies
to
go
extinct
after
they
makke
the
list
.
Sadly
many
species
do
go
extinct
while
waiting
for
consideration
.
