University of Massachusetts geoscientists Drs. Michael Mann and Raymond Bradley published this news-breaking research paper in the April 23rd, 1998 issue of Nature. The authors examine climate data in detail and conclude that three recent years were the warmest since 1400 AD. In addition to the paper (Adobe Acrobat [.pdf] format--click on "Study"), the site contains a news release, two of the figures from the paper, and a FAQ about the paper. Note that print quality of the paper is considerably better than viewing quality.
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