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Environmental News>

Research: Earth faces the most severe warming in 1,200 years.

  • 2007-05-22

According to a study published in a scientific journal, global warming is currently more severe than at any time in the past 1200 years. Professors Osborne and Brifleigh of the University of East Anglia analyzed global temperature changes since the 9th century AD at 14 locations in the Northern Hemisphere, using tree rings, shell fossils, and ice cores. Supported by other evidence of global warming, the study found that the warming phenomenon of the 20th century was particularly pronounced. The current global warming began in the late 20th century, is more widespread, and the temperature anomalies have lasted longer than at any time since the 9th century. To understand whether this widespread temperature increase is a natural weather pattern, scientists compared the warming temperatures across the Northern Hemisphere with the differences in the spacing between cold and warm climates over the past 1200 years. The study also cited medieval weather logs and records of exceptional weather conditions, such as the Belgian Straits and centuries of severe cold in the Netherlands. Researchers observed that the spacing between the tree rings of evergreen trees growing in Scandinavia, Siberia, and North America increased with warmer weather. The chemical substances contained in the Greenland ice pillars also indicate that the temperatures were relatively high during those years.

(Excerpt from Yahoo News)

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