As can be seen in Fig. 13.1, temperate and tropical soils dominate natural N2O emissions on a global scale, although emissions from the world's oceans are also important. However, for all these 'natural' N2O sources it is difficult to separate the impacts of human activities. In particular, our release of reactive nitrogen in the form of leached fertilizers, ammonia emissions from livestock and NOx from fossil fuel combustion can be important drivers of 'natural' N2O emissions.
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