Thus lowering decomposition and in turn lowering primary production. The burning of fossil fuels increases NoCo2 in the atmosphere and as N2 is produced by dentrification and released back into the atmosphere it reacts and becomes nitrous oxide. Nitrous Oxide is a greenhouse gas and c0ontributes to global wariming. Two ways humans are increasing Nitrogen fixation are by adding nutrients to the soil and by defroestation. Nutrient addition causes excess nitrogen to be drained away from areas of soil causing those areas to become useless for aggriculture.
Deforestation causes large plots of land to lose plants that help contribute to the nitrogen cycle.
If one link is lost, the system will eventually fail.