This process is used to convert atmospheric nitrogen into ammonia, which is then used to produce fertilizer. The Haber-Bosch process is one of the most important industrial processes in the world, and it has had a major impact on the global food supply. However, it also requires a great deal of energy, and it produces greenhouse gases.

2. The burning of fossil fuels

Fossil fuels release nitrogen oxides into the atmosphere, which can contribute to smog and acid rain. Nitrogen oxides can also react with ammonia to form ammonium nitrate, which is a major component of particulate matter. Particulate matter is linked to a number of respiratory problems, including asthma, bronchitis, and lung cancer.