Smith counters that if you factor in the hidden cost of government corn subsidies, environment degradation, and decreased human health and animal welfare, grass-fed is the more cost-effective model.

史密斯反驳说，如果你把政府谷物补贴的隐藏成本、环境恶化以及人类健康和动物保护的减少考虑在内，那么草饲模式更具成本效益。

youdao

Soil erosion is a major factor of causing environmental degradation.

土壤侵蚀是造成环境退化的一个主要因素。

youdao

Eutrophication is the main factor for the degradation of lake ecosystem.

富营养化是导致湖泊生态系统退化的主要因素。

youdao

But the report singles out food production as the other major factor driving environmental degradation.

VOA: standard.2010.06.04

The degradation on the option tyre, the soft tyre, is going to be the key factor, and it's something we looked pretty good at yesterday, so it's going to be a long race.

BBC: Downbeat Mark Webber promises fight to the flag