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