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1. Carbon Dioxide (CO2) accounts for approximately what percentage of the 'greenhouse effect'? (Choose one)
1.
3%
23%
71%
2. Lung damage attributed to ozone-polluted air is a risk faced by about how many Americans?
2.
1 out of 2
3 out of 5
4 out of 10
3. More than 90% of the world's total supply of drinkable water in contained where?
3.
in the oceans
in rivers, lakes, and streams
in the groundwater
4. Of the 9,900 bird species that have been identified, what percent are threatened with extinction?
4.
less than 5 percent
approximately 12 percent
over 30 percent
5.One way for Americans to save over 600,000 gallons of gasoline and prevent 12 million pounds of 'greenhouse' gases from entering our atmosphere every day, is if we:
5.
keep the correct air pressure in our automobile tires.
all take our vacations at about the same time.
carried just one more passenger in our commuter car.
6.What is it that city lighting creates that decreases our ability to see the stars at night?
6.
starglow
stardust
starry eyes
