1
.
Since
____________________
the
global
temperature
has
risen
by
about
one
-
and
-
a
-
half
degrees
F
.
2
.
Global
warming
is
a
change
in
the
worlds
____________________
,
or
the
pattern
of
weather
over
____________________
periods
.
3
.
Global
warming
is
caused
by
____________________
____________________
.
These
gases
are
really
effective
at
absorbing
and
redirecting
____________________
.
4
.
Some
examples
of
greenhouse
gases
are
____________________
____________________
,
____________________
and
even
water
vapor
.
5
.
The
trapping
of
heat
due
to
____________________
____________________
is
called
the
greenhouse
effect
.
6
.
Without
greenhouse
gases
our
planet
would
____________________
.
7
.
Burning
____________________
____________________
releases
huge
amounts
of
carbon
dioxide
.
8
.
Carbon
Dioxide
is
a
powerful
____________________
gas
.
9
.
And
cow
digestion
produces
large
amounts
of
____________________
.
10
.
Methane
traps
____________________
times
more
heat
than
Carbon
Dioxide
.
11
.
Deforestation
adds
to
the
problem
because
dead
trees
can
no
longer
absorb
____________________
____________________
from
the
atmosphere
.
12
.
Our
oceans
are
absorbing
most
of
the
additional
____________________
,
this
destroys
____________________
____________________
.
13
.
The
polar
ice
caps
are
____________________
,
and
this
causes
sea
-
level
to
____________________
.
14
.
Warmer
air
means
:
-
Stronger
____________________
and
____________________
.
-
Heavier
rainfall
and
____________________
.
-
severe
____________________
-
rainfall
will
dry
up
,
and
forests
will
turn
to
____________________
