When economists think about climate change, some think a lot about horse manure. Specifically, they consider the greatmanure crisis of the late 1800s, when the world’s cities relied on horses for transport to such an extent that a public sanitation disaster loomed. Fine minds set to work on a crisis that The Times of London estimated in 1894 was so dire that in 50 years every street in the city would be buried 9ft deep in horse droppings.
當經濟學家思考氣候變化問題時，其中一些人會重點研究馬糞。具體來說，他們研究的是19世紀末的馬糞大危機。當時世界各地的城市極度依賴馬匹作為交通工具，以至于一場公共衛生災難迅速逼近。1894年，倫敦《泰晤士報》(The Times)估計，50年后這場危機會變得非?？膳?，倫敦的每一條街道都將覆蓋9英尺厚的馬糞，于是一群聰明人開始著手應對這場危機。
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