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NATURE GEOSCIENCE | LETTER
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Substantial nitrogen pollution embedded in international tradeNature Geoscience 9, 111–115 (2016) doi:10.1038/ngeo2635Received 27 July 2015 Accepted 14 December 2015 Published online 25 January 2016 Corrected online
28 January 2016Article tools
Anthropogenic emissions of reactive nitrogen to the atmosphere and water bodies can damage human health and ecosystems1, 2. As a measure of a nation’s contribution to this potential damage, a country’s nitrogen footprint has been defined as the quantity of reactive nitrogen emitted during the production, consumption and transportation of commodities consumed within that country, whether those commodities are produced domestically or internationally3. Here we use global emissions databases4, 5, a global nitrogen cycle model6, and a global input–output database of domestic and international trade7, 8 to calculate the nitrogen footprints for 188 countries as the sum of emissions of ammonia, nitrogen oxides and nitrous oxide to the atmosphere, and of nitrogen potentially exportable to water bodies. Per-capita footprints range from under 7 kg N yr−1in some developing countries to over 100 kg N yr−1 in some wealthy nations. Consumption in China, India, the United States and Brazil is responsible for 46% of global emissions. Roughly a quarter of the global nitrogen footprint is from commodities that were traded across country borders. The main net exporters have significant agricultural, food and textile exports, and are often developing countries, whereas important net importers are almost exclusively developed economies. We conclude that substantial local nitrogen pollution is driven by demand from consumers in other countries.
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