To complicate matters further, nitrous-oxide and methane emissions from farms far outweigh carbon-dioxide emissions in global-warming potential.

• 为了将此焦点话题更加复杂化，一氧化二氮气体与沼气的排放量在全球变暖潜在因素中远远超过了二氧化碳的排放量并更具危害性。