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NEWS AN D Notes Twentiet h Century Global Warming peratures are probably unprecedented in at least 1200 Unprecedented , NOA A Scientist Reports years. In addition, our study of the Medieval Warm Period supports the likelihood that no known natural Paleoclimatologists, using a compilation of avail- phenomenon can explain the record twentieth century able data from around the Northern Hemisphere, have confirmed that twentieth century global warming is warmth. Twentieth century global warming is a real- unprecedented relative to the last 1200 years. Jonathan ity and should be taken seriously." Overpeck, head of NOAA's Paleoclimatology Pro- Ne w Climate Syste m Mode l Show s Earth's gram in Boulder, Colorado, says that research has Surfac e Temperatur e Rising failed to identify any known natural climate-forcing mechanism that could have generated all of the unprec- The earth's mean surface temperature is expected edented warming that has led to 1998 being, most to rise 0.2 K (0.36°F) per decade over the next four likely, the warmest year in at least 1200 years. decades, according to a new modeling study. The study Overpeck also said that the so-called Medieval uses a climate system model (CSM-1) developed at the Warm Period, a
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Feb 1, 1999
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