Light
pollution
is
the
excessive
or
misdirected
____________________
lighting
that
is
threatening
to
destroy
virtually
all
casual
stargazing
.
Throughout
much
of
the
United
States
for
instance
,
millions
upon
millions
of
precious
watts
are
____________________
because
poorly
designed
streetlamps
send
a
portion
of
their
light
into
the
sky
.
Over
the
past
two
decades
,
the
____________________
in
this
ubiquitous
,
overly
bright
and
garish
lighting
has
so
polluted
the
nighttime
____________________
that
driving
on
some
roadways
has
become
downright
dangerous
because
of
excessive
glare
.
Sadly
,
we
are
also
losing
our
view
of
the
night
sky
?
the
next
____________________
natural
resource
.
A
generation
from
now
,
if
the
current
siege
of
?
light
blight
?
goes
unchecked
,
seeing
the
stars
will
be
reduced
to
a
museum
rendition
,
with
the
artificial
firmament
of
your
local
planetarium
becoming
our
children's
only
view
of
the
universe
.
But
there
are
____________________
to
this
problem
.
Light
pollution
can
be
controlled
and
even
____________________
.
As
one
example
,
this
can
be
done
by
investing
in
more
efficient
,
properly
shielded
lighting
fixtures
;
determining
systematic
criteria
for
how
much
lighting
is
needed
in
a
given
situation
;
and
perhaps
even
imposing
late
-
night
"
____________________
"
on
outdoor
advertising
signs
.
You
can
do
your
part
,
by
learning
more
about
light
pollution
,
and
by
taking
____________________
to
reduce
extra
nighttime
lighting
in
your
own
town
and
backyard
.
These
steps
may
not
only
enable
you
to
see
the
stars
better
,
but
could
also
save
you
money
on
____________________
and
help
reduce
the
world's
energy
crises
.
Finally
,
there
is
Earth
Hour
,
a
movement
established
in
____________________
in
____________________
,
Australia
,
when
2
.
2
million
individuals
and
more
than
2
,
000
businesses
turned
their
lights
____________________
for
one
hour
to
take
a
stand
____________________
climate
change
.
Just
one
year
later
,
Earth
Hour
had
become
a
global
____________________
movement
with
more
than
50
million
people
across
35
countries
participating
.
During
the
hour
,
global
____________________
such
as
the
Sydney
____________________
Bridge
,
CN
Tower
in
Toronto
,
the
Empire
State
Building
in
New
York
,
Golden
____________________
Bridge
in
San
Francisco
,
and
Rome's
____________________
all
stand
in
darkness
,
as
symbols
of
hope
for
a
cause
that
grows
more
urgent
by
the
hour
.
This
year
will
be
no
different
.
Earth
Hour
2018
will
take
place
____________________
on
Saturday
,
March
____________________
at
8
.
____________________
p
.
m
.
(
local
time
)
.
For
more
details
:
http
:
/
/
www
.
earthhour
.
org
/
