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Something for anti-technology environmentalists to keep in mind:

Let me give you one small example. We complain a lot about air pollution today, but there were 200,000 horses in New York City, at the beginning of the 20th century defecating everywhere. And when you walked around in New York City, you were breathing pulverized horse manure — a much worse pollutant, than the exhausts of automobiles. Indeed in the United States, the automobile was considered the solution to the horse problem because pulverized horse manure carried a lot of deadly pathogens.