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Earth Day: How much do you know about climate change? Take our quiz.

A lot of people have opinions about climate change, but do they really know what they are talking about? Test your knowledge with this quiz.

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A full moon appears through the blue glow of the Earth's atmosphere, in this photo taken aboard the Space Shuttle Discovery in 1999.

NASA/Reuters/File

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Question 1 of 10

1. Which of the following is NOT a greenhouse gas?

Methane

 

Nitrous oxide

 

Argon

 

Ozone

 
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Question 1 of 10

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