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Long-term measurements and research is summarized on the effects of changing climate on the structure and function of a Northern Forest at the Hubbard Brook Experimental Forest (HBR) in New Hampshire,USA.HBR is a U.S.Forest Service intensive research site and a member of the National Science Foundation Long-Term Ecological Research (LTER) network.Long-term measurements,experiments and model calculations have been conducted to assess past climate and to project the future impacts of changing climate.