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What word from the text means 'things people do'?
human activity
When did astronomers start to know about light pollution?
They began to realize it in the 1970s.
Why did stars 'disappear'?
City lights made them impossible to see.
How many stars could people see one hundred years ago?
They could see about 1,500 stars.
Is it true that if people use more lights, light pollution is going to happen?
True
What causes light pollution?
It is caused by excess light that is beamed into the sky.
Why does excess light create light pollution?
It reflects onto low clouds, causing a sky glow that blots out the stars.
According to David Crawford, how can people stop light pollution?
Lights should point at the ground, not at the sky.
How much lighting in the US is not used effecttively?
About one-third of all lighting in the United States is wasted.
What creates harmful acid rain?
Sulfur dioxide creates harmful acid rain.
What problem does carbon dioxide cause?
Carbon dioxide traps heat near the Earth's surface, causing global warming.
What does Travis Longcore do?
He's an ecologist.
How do birds use the stars?
They use the stars like street signs to find their way.
What makes birds fly in the wrong direction?
Lights from buildings make them veer off course.
In 1954, why did about 50,000 birds die?
They flew straight into the ground because of the spotlights at a US Air Force.
What word means 'active at night'?
nocturnal
