The Greatest Contribution to the Total Human Input of Nitrogen

Question

The greatest contribution to the total human input of nitrogen per year in is __________.
A) Fossil fuels burning
B) Nitrogen fixation associate with agricultural crops
C) Manufacturing of synthetic fertilizer
D) Deforestation

Accepted Answer

Manufacturing of synthetic fertilizer is the greatest human contribution to the total input of nitrogen per year. This process, known as the Haber-Bosch process, converts atmospheric nitrogen to ammonia, which is then used to make nitrogenous fertilizers. This has significantly increased the amount of reactive nitrogen in the biosphere, impacting ecosystems and the nitrogen cycle.