Which set of greenhouse gases is most commonly associated with emissions from agriculture, including the use of fertilizers and soil management practices, according to the lecture?

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The question asks which set of greenhouse gases is most commonly associated with emissions from agriculture, including fertilizers and soil management practices.
Option 1: Methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2) from a combination of livestock, fertilizer use, and soil disturbance. This option correctly captures the key agricultural emission sources: enteric fermentation and manure in ruminant animals produce CH4; fertilizer application and soil processes release N2O; soil disturbance and residue decomposition contribute CO2. It reflects the broad mix of gases linked to both animal production and crop management.
Option 2: Nitrous oxide (N2O) generated by the breakdown of nitrogen-based fertilizers. While N2O from fertilizer breakdown is real, this option is incomplete because it omits methane from enteric fermentation and CO2 from soil processes, giving an incomplete picture of agricultural emissions.
Option 3: Carbon dioxide (CO2) produced by soil respiration and residue decomposition. CO2 is indeed released from soils and plant residues, but focusing only on CO2 ignores major agricultural greenhouse gases like methane from ruminants and nitrous oxide from fertilizer management, making this option insufficient.
Option 4: Methane (CH4) resulting from livestock digestion and rice cultivation. CH4 from enteric fermentation and rice paddies is important, but this choice neglects nitrous oxide and CO2 emissions tied to fertilizers and soil disturbance, thus not representing the full agricultural GHG profile.
In sum, agriculture involves a triad of gases tied to distinct practices: CH4 from livestock and rice, N2O from fertilizer management, and CO2 from soil processes; the first option encompasses all these components together.

CLMTC5008_001_2025_3 - Climate Change Mitigation Quiz 6 | November 10th

Which set of greenhouse gases is most commonly associated with emissions from agriculture, including the use of fertilizers and soil management practices, according to the lecture?

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