____________________
the
time
our
children
reach
adulthood
,
hundreds
of
species
____________________
____________________
____________________
(
disappear
)
off
the
planet
.
One
study
estimated
that
____________________
2050
,
37
percent
of
terrestrial
species
____________________
____________________
____________________
____________________
(
die
out
)
or
will
be
in
danger
of
extinction
.
That
is
well
over
____________________
the
next
30
years
.
Sea
life
is
also
in
danger
.
____________________
the
time
that
sea
levels
rise
50
centimeters
(
about
20
inches
)
,
one
-
third
of
nesting
beaches
in
the
Caribbean
____________________
____________________
____________________
____________________
(
lose
)
,
leading
to
the
decline
in
turtle
populations
.
By
the
end
of
this
century
,
it
is
believed
that
seawater
temperatures
____________________
____________________
____________________
(
rise
)
enough
to
affect
the
food
supply
of
some
oceans
species
.
This
impacts
various
species
in
different
ways
.
For
example
,
it
is
believed
that
____________________
only
a
few
decades
,
the
reproductive
cycle
of
the
sperm
whale
____________________
____________________
____________________
____________________
(
affect
)
,
which
threatens
the
very
survival
of
the
whale
itself
.
