Methane from livestock as a key emission source

Steps:

• Identify major methane sources: agriculture (livestock digestion), landfills, and energy production.
• Recall methane (CH4) is a potent greenhouse gas from anaerobic processes like cow rumen fermentation.
• Evaluate options: Check which directly targets livestock-related emissions.
• Select the strategy that cuts animal agriculture to lower methane output.

Why C is correct:

• Livestock farming, especially ruminants like cattle, produces methane via enteric fermentation; reducing it directly decreases emissions per IPCC guidelines on agricultural GHGs.

Why the others are wrong:

• A: Flue gas desulfurisation removes sulfur dioxide from fossil fuel combustion, unrelated to methane.
• B: Planting trees sequesters CO2 through photosynthesis but does not address methane sources.
• D: Catalytic converters reduce CO, NOx, and hydrocarbons in vehicle exhaust but not methane.

Final answer: C