An even simpler explanation: CO2 is the culprit precisely because it
makes up so little of the atmosphere. Because its concentration is so
small, things we do can actually affect the amount in an easy-to-
measure way. And since it does have a strong greenhouse effect, it
results in warming. Water vapor is a stronger greenhouse gas and has
a larger concentration but there's very little we can do to change its
concentration. Except indirectly. And this is where CO2 comes in
again. The CO2-induced temperature increase allows the atmosphere to
hold more water vapor which leads to another temperature increase.
But the root cause is CO2.
Rob
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