็Humans have traditionally been omnivores,with a diet of both meat and vegetables. but lately it seems we've become a society of meat eaters. According to the United Nation's Food and Agriculture Organization (FAO),global de mand for meat has increased over 500 percent in the past 50 years. Two things explain this: the Earth's population expected to reach nine billion people around 2050,and with developing countries getting richer,this trend won't stop any time soon.