While human-caused global climate change has long been a concern for environmental scientists and is a well-known public policy issue, the problem of excessive reactive nitrogen in the environment is little-known beyond a small but growing circle of environmental scientists.Rushing river

Two new papers by leading environmental scientists highlight the problem in the May 16 issue of the leading journal Science. The researchers discuss how food and energy production are causing reactive nitrogen to accumulate in soil, water, the atmosphere and coastal oceanic waters, contributing to the greenhouse effect, smog, haze, acid rain, loss of biodiversity, coastal "dead zones" and stratospheric ozone depletion.

University of Virginia environmental sciences professor James Galloway, the lead author of one of the Science papers, said: "The public does not yet know much about nitrogen, but in many ways it is as big an issue as carbon, and due to the interactions of nitrogen and carbon, makes the challenge of providing food and energy to the world's peoples without harming the global environment a tremendous challenge."

Co-author Dr Mark Sutton from the UK Centre for Ecology & Hydrology who contributed to the new analysis and leads the EU funded NitroEurope Integrated Project said: “The new papers published this week in Science highlight the need to develop a more integrated approach in responding to the 'global nitrogen challenge’.” 

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Within Europe the need for an integrated approach to the nitrogen problem has recently been recognized by the Geneva Convention on Long Range Transboundary Air Pollution, which has established a new "Task Force on Reactive Nitrogen" (TFRN).

The aim of the new Task Force is to start investigating more holistic approaches to managing reactive nitrogen, linking the threats to air quality and biodiversity loss with other issues like water quality and greenhouse gas balance. 

Dr Sutton, together with Prof. Oene Oenema (Wageningen University Research centre), has been appointed as co-chair of the TRFN, with the first meeting taking place next week (20-23 May) at Wageningen in the Netherlands. 

A major contribution to the TFRN will come from the European Centre of the International Nitrogen Initiative, which has established the first 'European Nitrogen Assessment' (ENA). This is a major review activity that will analyse the scientific basis for developing more integrated approaches to managing reactive nitrogen.

Dr Sutton noted: "One of the first tasks will be to look at how well existing nitrogen-related policies fit together.  Current policies have been developed to meet different needs, and it looks like there are challenging inconsistencies.  We must develop a new way of thinking that links the multiple roles of reactive nitrogen in environment and society."

Additional information

CEH's Biogeochemistry Science Programme

The NitroEurope Integrated Project - co-ordinated by Dr Sutton at the Centre for Ecology & Hydrology (external link)

European Centre of the International Nitrogen Initiative - hosted by the Centre for Ecology & Hydrology (external link)

Media enquries about NitroEurope, the European Centre of the International Nitrogen Initiative or the new "Task Force on Reactive Nitrogen" should be directed to the Centre for Ecology & Hydrology press office.

Impacts of nitrogen on the environment

  • In its inert form, nitrogen is harmless and abundant, making up 78 percent of the Earth's atmosphere. But in the past century, with the mass production of nitrogen-based fertilizers and the large-scale burning of fossil fuels, massive amounts of reactive nitrogen compounds, such as ammonia, have entered the environment.
  • A nitrogen atom that starts out as part of a smog-forming compound may be deposited in lakes and forests as nitric acid, which can kill fish and insects. Carried out to the coast, the same nitrogen atom may contribute to red tides and dead zones. Finally, the nitrogen will be put back into the atmosphere as part of the greenhouse gas nitrous oxide, which destroys atmospheric ozone.

Task Force on Reactive Nitrogen (TFRN)

  • The Convention on Long Range Transboundary Air Pollution (CLRTAP), was established in 1979 under the United Nations - Economic Commission for Europe (UN-ECE). There are 51 parties to the Convention from Belgium to Belarus, including the European Community, Russian Federation, United States and Canada.
  • In 1999 the Convention established the Gothenburg Protocol on "Acidification, Eutrophication and Ground Level Ozone", which broke new ground in developing an integrated approach to international air pollution mitigation.  The Task Force on Reactive Nitrogen develops this concept, making the links between many forms of reactive nitrogen (nitrogen oxides, ammonia, nitrous oxide, nitrate leaching etc) and many interlinked environmental threats.
  • The inaugural meeting of the TFRN will take place jointly with the first workshop of the European Nitrogen Assessment, at the Wageningen International Conference Centre (20-23 May 2008).

The European Centre of the International Nitrogen Initiative

  • The European Centre of the International Nitrogen Initiative (INI) is a networking activity, with key contributions including the EU NitroEurope Integrated Project (primary research), the ESF Nitrogen in Europe (NinE) programme (science synthesis and exchange), and COST 729 (nitrogen at the science-policy interface).

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