The correct answer to this open question is the following.
Inhuman farming methods are cruel and unethical methods of treating the animals to make them produce more. Many times livestock is crammed together in such small places and is forced to feed in excess in order to gain weight. Other times animals are caged in unhealthy places. Some farmers use chemicals in their nutrition. But one of the cruelest is the way they kill the animals, making them suffer a lot.