What Nye doesn’t know is that in 1900, 93 million acres wete used for hay production for horses. About the same amount which is used for corn production now.
Horse manure in the streets was a problem, it stunk and carried diseases throughout the year.
In pre-automobile cites, it wasn' just the manure that was an issue (which was most dangerous from drying up into dust and being inhaled), storage of hay attracted rodents and posed huge fire risk, and horse carcasses added to the disease, rodent, pests dangers:
