Carbon Dioxide Is a More Important Greenhouse Gas Than Methane

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.