Well, no, nitrogen leaving the atmosphere is just not a concern. Biomass of all plants: 500 billion tons. Biomass of all human crops: 10 billion tons. Nitrogen’s share of plant mass: 3-4%, or 400 million tons. Mass of the atmosphere: 5.5 quadrillion tons. And most of the atmosphere is nitrogen.
Well, no, nitrogen leaving the atmosphere is just not a concern. Biomass of all plants: 500 billion tons. Biomass of all human crops: 10 billion tons. Nitrogen’s share of plant mass: 3-4%, or 400 million tons. Mass of the atmosphere: 5.5 quadrillion tons. And most of the atmosphere is nitrogen.