她察看了数千个人们共用水源、森林以及渔业资源的个案，发现确实存在很多的人们任意破坏公共品的例子。
She looked at thousands fo cases of humans sharing watersheds, forestry resources, fisheries, and discovered that, yes, in case after case, humans destroyed the Commons that they depended on.
较差的卫生条件也大大加重了水污染，从而增加了家庭的安全饮用水费用，降低了河湖渔业产量。
Poor sanitation also contributes significantly to water pollution—adding to the cost of safe freshwater for households, and reducing the production of fish in rivers and lakes.
较差的卫生条件也大大加重了水污染，从而增加了家庭的安全饮用水费用，降低了河湖渔业产量。
Poor sanitation also contributes significantly to water pollution—adding to the cost of safe freshwater for households, and reducing the production of fish in rivers and lakes.
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