And to say products are unwholesome because we Americans don't like to eat them is incorrect. There was a section for smoking meats, a section for processing meats into sausages, and a section for rendering. During the years after World War II, the meat industry became more specialized. Now that the rendering companies are entities unto their own they can service many slaughterhouses, plus process any other animal remains that can be rendered. The denatured carcasses and other waste can then be transported to the rendering facility.
Phenol is derived from the distillation of coal tar, creosote from the distillation of wood.
Both substances are very toxic. Creosote was used for many years as a preservative for wood power poles. Its effect on the environment proved to be so negative that it is no longer used for that purpose. The condemned livestock carcasses treated with these toxic chemicals can then become meat and bone meal for the pet food industry. Worse yet, since rendering facilities are not government-controlled, any animal carcasses can be rendered, including those of cats and dogs.