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

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

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.

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

Methane

Nitrous oxide

Argon

Ozone

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