Only producing bio-fuels without the use of additional land is justifiable in terms of environmental and social policy. This would mean using agricultural and other waste, which would otherwise rot and produce nearly equal amounts of CO2 and methane, an even more dangerous greenhouse gas.
把任何形式的土地用于生产生物燃料都是毫无道理的。只有不使用额外的土地来生产生物燃料才是对环境和社会政策有益的。也就是说应该使用农业有机废弃物和其他废弃物，这些废弃物本来会腐烂并且排放出几乎同等量的二氧化碳和一种危害更大的温室气体甲烷。