Earth may have been slightly cooler during the 'Medieval Warm Period'
Global temperature records have shown that, taken globally, the Earth may have beenslightly cooler (by 0.03 degrees C) during the 'Medieval WarmPeriod' than in the early- and mid-20th century.
Global temperature records taken from ice cores, tree rings, and lakedeposits, have shown that, taken globally, the Earth may have beenslightly cooler (by 0.03 degrees Celsius) during the 'Medieval WarmPeriod' than in the early- and mid-20th century.


http://www.geo.umass.edu/faculty/bradley/bradley2003d.pdf
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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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Mediaeval warm period »Mediaeval warm period
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Earth may have been slightly cooler during the 'Medieval Warm Period'
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