Grade level: 3rd – 5th

Skills: circle graph

Related environmental issues: Climate change

Area level: National

Gases that trap heat in the atmosphere are called greenhouse gases and emissions of the greenhouse gases are a major factor of climate change.  The circle graph shows what types of gases consist of greenhouse gases and what percent each gas occupies among the greenhouse gases in the United States.

1. What type of gas occupies the most among greenhouse gases?
2. What type of gas has two times as much as nitrous oxide?
3. What percent of gases are either methane or fluorinated gases?

Source: US Environmental Protection Agency

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Answer keys

1. carbon dioxide
2. methane
3. 8%