I read somewhere how automobiles were the environmental cleanup of their times. We first had horses producing far more manure than a city could handle, with al

I read somewhere how automobiles were the environmental cleanup of their times. We first had horses producing far more manure than a city could handle, with all kinds of hygiene/smell/viability consequenses. People complained how cities became unliveable. Cars fixed all that. No more feed, no more manure, no more raising and keeping alive the animals. All replaced with a very energy dense fuel, a machine you can just leave on the street, and some very clean minimal exhaust. Then we all got cars.