Previous warmer periods caused by factors not present now
While there have been times in the Earth's history when it was warmer than now—eg the last interglacial (125,000 years ago) and Pliocene (3m years ago)—those periods were caused by factors such as solar forcing, the Earth's orbital wobbles or continental configurations that don't apply now.
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Anthropogenic Climate Change »Anthropogenic Climate Change
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Human impact on the Earth's climate? »Human impact on the Earth's climate?
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Case for significant anthropogenic forcing remains unclear »Case for significant anthropogenic forcing remains unclear
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Earth has been warmer in recent past prior to human impact »Earth has been warmer in recent past prior to human impact
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Previous warmer periods caused by factors not present now
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