Personally I prefer the pollution from internal combustion engines over the pollution from mules. When I was a teenager we owned (for a while) a mule named Roxie that my Dad used for plowing. Roxie, um, excreted gaseous exhaust with each step when pulling a one-bottom plow.
Dad (therefore!) sold Roxie and bought a Ford-Ferguson tractor, on which I had my first driving lessons.
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-- Carl
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