Human activities add large quantities of nitrogen to the environment, much of which gets washed into streams and rivers. These waterways transport some of that nitrogen to the oceans, but they also remove a significant portion of it through a process called denitrification: Microbes facilitate a series of chemical reactions that turn nitrate into dinitrogen gas, which is then released into the atmosphere.

Human activities add large quantities of nitrogen to the environment, much of which gets washed into streams and rivers. These waterways transport some of that nitrogen to the oceans, but they also remove a significant portion of it through a process called denitrification: Microbes facilitate a series of chemical reactions that turn nitrate into dinitrogen gas, which is then released into the atmosphere.

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