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Ecological Society of America - An overview of the scientific understanding of human-induced changes to the global nitrogen cycle and the consequences.
Illinois State Water Survey - More detailed information about how nitrogen passes through the atmosphere, biosphere, geosphere, and hydrosphere.
World Bank - a visual representation of the World Bank's nitrous oxide emissions dataset
Noticias & Eventos
Department of Ecology, State of Washington
Science News Online
News from around the world of science.
Google - Research database allows searching of the scholarly literature.
State of Victoria (Australia) - this animation provides a simple illustration of the nitrogen cycle in an agricultural context.
Environmental Protection Agency (EPA) - a national database of air emissions information, including nitrogen oxides (NOx) emissions by source. View information on air quality standards, trends, health effects, and programs to reduce NOx.