The clean-air cars of decades past

In my lectures & classes on social enterprise I make the point that the car was originally seen as an environmentally friendly alternative to the horse. The horse filled cities with shit, stink and disease; the car created a cleaner world by sending little clouds to the sky. Just look at early automobile ads, I tell folks. Mountains, clouds, clean air--what we now see as exhaust-spewing monstrosities were the earth-friendly hybrids of the day.

Here's another example from Vintage Ads: