生产如此数量的粮食可能大大提高环境中二氧化碳和氮的水平，引起很多物种的灭绝。

Producing that amount of food could significantly increase levels of carbon dioxide and nitrogen in the environment and cause the extinction of numerous species.

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其它气体，如甲烷、一氧化二氮等，尽管没有像二氧化碳那样严重的影响气候，但他们依然在加剧全球变暖。

Many other gases, such as methane and nitrous oxide, contribute to warming, although not as much as carbon dioxide.

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食物生产的高碳排放来自于畜牧业以及大量使用的化肥，其中有些分解成一氧化二氮，而一氧化二氮对全球变暖的危害性比二氧化碳的要高出数百倍。

The high emissions come from livestock farming and from the heavy use of fertilisers, some of which break down into nitrous oxide, a global warming gas hundreds of times more powerful than CO2.

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