放牧牲口同样伤害草原。
他们的土地几乎寸草不生；他们在沙漠荒野里放牧牲口；人们从看上去像闪光的浮冰的物质中提炼盐块。
Almost nothing grows on their land; their animals graze on desert bushes; the people mine ingots of salt from what looks like shimmering pack ice.
对每个牧民来说，多放牧一头牲口带来的好处都归自己所有，而过度放牧的成本则有所有牧民一起承担。
Each herdsman captures all the benefit from an extra animal but the cost of overgrazing is borne by all.
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