9
lesson pretestMultiple Choice

Pretest

Question 9 • TPS EdX Biology

Why is it commonly believed that carbon dioxide is responsible for global warming?

Answer
A
The warming effect associated with carbon dioxide has remained unchanged.
B
Carbon dioxide has a longer average lifetime in the atmosphere.
C
Other greenhouse gases amplify the effect of carbon dioxide.
D
Carbon dioxide levels in the Earth’s atmosphere have been steadily decreasing.
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