Respuesta :
Answer:
burning fossil fuels
Explanation:
By burning fossil fuels the amount of nitrogen being into the atmosephere will increase the levels of natural nitrogen that is already in the atmosphere witch is a cause of global warming.
Human activities, such as making fertilizers and burning fossil fuels, have significantly altered the amount of fixed nitrogen in the Earth's ecosystems. In fact, some predict that by 2030, the amount of nitrogen fixed by human activities will exceed that fixed by microbial processes
