Light Pollution
What is light pollution caused by?
excess light
When (what year) was the first light bulb invented?
1879
What do birds use to navigate?
the stars
What does benefit mean?
something helpful
In the text, wasted light means light that is…
not needed
What does light pollution blot out?
the stars
What kind of fixtures cause problems?
bad light fixtures
When (what time of day) do many birds migrate?
at night
What does environment mean?
natural world
Power plants release what?
gases
What reflects light and creates sky glow?
low clouds
What do bad fixtures do wrong?
shine upward
What happens when birds get confused?
they crash into buildings
What does migrate mean?
move places
Birds veer off course means they…
change direction
Who first noticed light pollution?
astronomers
How much U.S. lighting is wasted?
one-third / (~33%)
How many birds died in 1954?
50,000 birds
What does release mean?
let out/ let go
Cities try to reduce lights during…
migration season
When (what year) did astronomers notice the problem?
the 1970s
What type of fuel do power plants burn?
coal
What causes hatchlings (baby turtles) to go the wrong direction?
light coming from land
What does reduce mean?
use less
At the flick of a switch means…
very easily