Carbon Dioxide Is a More Important Greenhouse Gas Than Methane

question 29

Multiple Choice

Carbon dioxide is a more important greenhouse gas than methane because

• A) carbon dioxide is made exclusively by humans and methane is natural.
• B) carbon dioxide has a stronger warming potential, a higher atmospheric concentration, and longer lifetime than methane.
• C) carbon dioxide has a lower greenhouse effect at current levels (W/m²) than methane.
• D) methane is destroyed by sunlight.
• E) methane contains no carbon, a key ingredient in greenhouse gases.

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