WORLD AT ITS WARMEST OF PAST 1,200 YEARS, RESEARCHERS SHOW
Tree rings and seashells help reveal unusual climate of last half century
By Martin Mittelstaedt, ENVIRONMENT REPORTER
The last part of the 20th century is considered by many scientists to be the warmest period since modern record-keeping began around the 1850s, but new research indicates the era is even more remarkable.
The warmth in which the Northern Hemisphere has basked since the middle of the 20th century has been the most widespread and longest period of unusual climate experienced at any time during at least the past 1,200 years, according to a research paper in the journal Science.
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