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This lecture explores the past and future changes in atmospheric deposition of nitrogen and its consequences on ecosystems. It discusses the impact of human activities on nitrogen inputs to terrestrial and marine ecosystems, focusing on eutrophication, acidification, and atmospheric acidity. The lecture also covers global chemistry-transport modeling studies on the biogeochemical cycle of nitrogen, the role of atmospheric acidity, and the potential consequences for ecosystems. Recent efforts in improving global atmospheric deposition data through measurement-model fusion activities are also highlighted.