Human Impact On Air And Climate The importance of human influence on global climate change was again highlighted in a groundbreaking study of Earth's temperature over the past 600 years. Reconstructing the global temperature record, climatologists have determinined that three recent years were the warmest years since AD 1400 -- 1997, 1995, and 1990. The study, conducted by Michael Mann and Raymond Bradley of the University of Massachusetts geosciences department, along with University of Arizona colleague Malcolm Hughes, is detailed in th....

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