In the past many large and small mammals have been domesticated. The population has acquired immunity against the great epidemics of the past. Zoonotic infections like the black plague, smallpox, tuberculosis, measles, typhoid and cholera could be treated with vaccination and antibiotics.Since the middle of the twentieth century we have a new situation, caused by intensive farming. All meat of farmed mammals is only produced by manual insemination of cattle, pigs and rabbits.The population explosion and famine on earth have caused man to artificially inseminate animals and to breed exclusively for consumption. Fast food and an increase in meat consumption in the West are simulated in other parts of the world. Fast food, unnatural food and hamburger consumption lead to obesity and chronic diseases. In the meantime, the number of cancer diseases is increasing and is nowadays prime cause of chronic diseases and premature death in the elderly. The ceiling for meat and meat products has already been reached with the current 7 billion world population.Global warming is largely the result of intensive livestock produc-tion. During the last ice age man was forced to eat more meat be-cause there were fewer grains, fruits, nuts and seeds. Will modern man eat more vegetable food now that the earth is warming up? The pig used to be kept as a food reserve for the cold winter months. Hams and sausages etc. We have started to eat more meat without fruit and vegetables. Modern farming methods contribute significantly to desertification and climate change due to water and air pollution from intensive breeding of pigs, poultry and livestock. By breaking down agricultural land, we are reducing its enormous ability to retain and contain carbon.