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Anthropogenic sources of fixed nitrogen are roughly half the amounts contributed by all other natural sources.
Air Cargo
Goods being transported by aircraft, often for commercial purposes or rapid delivery.
Pollutants
Substances or objects that cause pollution, negatively affecting air, water, or soil quality.
Marginal Benefit
The additional satisfaction or utility gained by consuming one more unit of a good or service.
Marginal Private Cost
The additional cost incurred by a producer or a consumer for producing or consuming one more unit of a good, excluding any external costs.
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