In agricultural sector, the main agricultural GHG emission is ____

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First, let's restate the question to keep the focus clear: In the agricultural sector, the main agricultural GHG emission is ____. 
Option A: CO2. While CO2 is a major greenhouse gas globally, in agriculture its relative contribution is typically not the primary emission when focusing on enteric processes and manure management. Other gases from agricultural processes tend to have higher warming potential per unit and are more sector-specific.
Option B: O3 (ozone). Ozone is a greenhouse gas in the atmosphere but is not emitted directly by agricultural activities in the same way as methane or nitrous oxide; it is more of a secondary pollutant formed in the atmosphere, not a direct product of typical farming practices.
Option C: CH4 (methane). A key feature of many agricultural systems—especially ruminant livestock like cows and sheep, plus enteric fermentation and manure management—is the release of methane. Methane has a high global warming potential and is typically the dominant GHG from the agricultural sector when the focus is on agricultural emissions. This makes CH4 a central concern in agricultural GHG inventories.
Option D: O2 (oxygen). Oxygen is not a greenhouse gas; it is a basic atmospheric constituent and does not serve as a source of warming via agricultural processes in the same way as CH4, CO2, or N2O.
Option E: N2 (nitrogen). Nitrogen gas itself is inert in the atmosphere and not a greenhouse gas. While forms of nitrogen compounds (like nitrous oxide, N2O) are important greenhouse gases linked to soil and manure processes, the option given as N2 does not represent a greenhouse gas emission from agriculture.
In sum, the reasoning hinges on recognizing the prominent role of enteric fermentation and manure management in agriculture, which makes methane (CH4) the gas most characteristic of—and typically most significant within—the sector's greenhouse gas emissions. The remaining options either refer to gases that are not primarily emitted from agricultural activities (O3, O2, N2) or refer to a gas that is not the main agricultural emitter in standard inventories (CO2, which is important overall but often not the dominant agricultural gas compared to CH4 and N2O in many farming systems).

GEO_011_001_25S Exam 3

In agricultural sector, the main agricultural GHG emission is ____

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