A '''warm period''' in the earth's history is a time when global temperatures are significantly warmer than average. Every warm periods in the past has been preceded by a cool period.
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A '''warm period''' in the [[earth]]'s history is a time when global temperatures are significantly warmer than average. Every warm periods in the past has been preceded by a cool period.
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==See also==
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*[[Global warming]]
==External links==
==External links==
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*[http://climate.geologist-1011.net/HoloceneTemperatures.png graph of four historical warm periods]
*[http://climate.geologist-1011.net/HoloceneTemperatures.png graph of four historical warm periods]