Earth
is
around
for
4
.
5
billion
years
old
.
Climate
has
always
been
changing
throughout
all
these
years
.
Scientists
have
known
about
____________________
____________________
for
about
200
years
.
In
1827
,
the
French
mathematician
Joseph
Fourier
learned
that
Earth
?
s
atmosphere
____________________
____________________
from
the
sun
like
____________________
.
Atmosphere
is
the
air
that
surrounds
the
Earth
.
It
is
formed
of
different
gases
,
including
nitrogen
,
oxygen
,
argon
,
and
carbon
dioxide
.
Carbon
dioxide
is
a
gas
that
____________________
heat
from
the
sun
.
The
collected
scientific
data
proved
there
is
now
about
10
percent
more
carbon
dioxide
than
previously
.
The
more
carbon
dioxide
in
the
atmosphere
,
the
hotter
the
temperatures
become
.
The
glaciers
from
the
Himalaya
mountains
in
Asia
are
stating
to
melt
more
rapidly
.
The
Himalayas
____________________
seven
large
Asian
rivers
.
The
melting
of
the
glaciers
will
cause
environmental
problems
such
as
____________________
and
____________________
in
Asia
and
Europe
.
Are
you
skeptic
about
it
?
