The theory of global warming states that the average temperature of the earth has been increasing over time. This theory will be most strongly affected by scientific studies that

The theory concerns whether Earth’s average temperature has increased over time, so evidence about past temperatures is most directly relevant. Studies that reveal how Earth’s temperature fluctuated in the past can show whether the recent trend is unusual or part of a longer pattern. Measuring temperatures at the poles or more precisely may help, but those studies alone do not establish how temperatures changed over time.

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