Final answer:
Nitrogen from fossil fuel emissions ends up in the atmosphere, contributing to climate change and other environmental impacts.
Step-by-step explanation:
Nitrogen from fossil fuel emissions primarily ends up in the atmosphere in the form of nitrogen oxides (NOx). The combustion of fossil fuels, such as coal, oil, and natural gas, releases nitrogen compounds into the air, contributing to air pollution.
The nitrogen oxides emitted from fossil fuel combustion include nitrogen dioxide (NO2) and nitric oxide (NO). These compounds can have various environmental impacts, including contributing to air quality issues and forming other pollutants such as particulate matter and ground-level ozone.
While some nitrogen compounds may undergo deposition to the Earth's surface through processes like rain or particle settling, a significant portion remains in the atmosphere. Nitrogen oxides can also participate in atmospheric reactions that contribute to air pollution and influence ecosystems. Overall, the atmosphere serves as a major reservoir for nitrogen from fossil fuel emissions.