Warm air tends to be humid, and as humidity of air increases, the amount of rainfall also increases. So, the fact that rainfall totals for most continents have been increasing over the past five air temperature is increasing as well.
What this question is testing
Your task
Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.
Common trap
Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.
Winning move
Predict what a right answer must do, then test each choice against the conclusion-evidence gap.
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