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Gas blast.

Human beings release the heat-trapping gas carbon dioxide into the air through many activities, such as burning fuels for use in transportation. Burning trees or cutting them down for land use also releases carbon dioxide. To see the sources of carbon dioxide from human activities, look at the pie chart (right). The chart shows, of the total amount of carbon dioxide released each year, the percent (%) that each source contributes. A percent is a number out of 100. For example, for every 100 units of carbon dioxide released into Earth's atmosphere, 19 of those units, or 19%, come from fuels used in H transportation.

1. Which source releases the highest percent of carbon dioxide each year?

2. Which source releases the lowest percent of carbon dioxide each year?

3. Which of the shown sources contribute more than 10 percent of the total amount of carbon dioxide released each year.

4. What is the total percent of carbon dioxide released by transportation fuels and power stations?

BONUS. What's one way you could help to reduce the percent of carbon dioxide released by transportation fuels each year?

Carbon Dioxide Released by Different
Sources Each Year

Industry            21%
Transportation      19%
fuels

Homes, business,    13%
and other sources

Land use             9%

Fossil fuel          8%
processing
and delivery

Power               30%
stations

1. Power stations 2. Fossil fuel processing and delivery

3. Homes, businesses, and other sources; transportation fuels; industry; power stations 4. 49

BONUS: Take fewer car rides.

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Title Annotation:Super SCIENCE
Publication:SuperScience
Date:Jan 1, 2007
Words:243
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