There are 200 million people in the world who live on cattle. Europeans first learned how to raise bison. Then Columbus sailed around the world, and the cows migrated to America, and later to Australia. There, due to the suitable climate and environment, cattle breed very quickly. Today, it is estimated that there are1400 million cattle living on the earth, four of which are in the United States. 500 million, Asia 5. 400 million head, Africa 1. 800 million, Australia 0. 2.4 billion head. In Australia, the area is 1. On the land of 230,000 square kilometers, there are 8. 30,000 cows. Local herders rely on helicopters to manage their huge herds. Argentina's negative market is one of the largest livestock transfer stations in the world. Here, 500,000 cows are auctioned every week, and the weighed cows are loaded on trucks and transported to slaughterhouses everywhere. Cattle are slaughtered, peeled, decomposed and cut into pieces to make steak or beef pancakes. The assembly line arranges each work in a compact and orderly way. Today, there are 200 million people in the world who live on cattle. The United States ranks first in meat consumption. Today, only people living in rich countries and regions live on beef as their staple food. From the ranking of meat consumption, the United States ranks first, followed by Europe, Brazil and Argentina. In some poor countries, people's recipes are still mainly vegetables and fruits. According to the survey, eating more beef can easily lead to heart disease, hypertension, diabetes and cancer, especially intestinal cancer. Scientists advise people to eat as little beef as possible. In addition, in the south of England from 65438 to 0985, some unstable cows were found, and their brains were covered with germs. This is what people talk about mad cow disease. Although so far, human beings have not been so sick as mad cows, it is scary enough for scientists to keep warning people. Not only that, too many cows also bring a huge burden to the environment. Cattle cause trouble everywhere and destroy the environment. Preference for beef can also cause environmental damage? It is estimated that many people will sneer at this. But that's the truth. 20% of the earth's land is eroding pasture, and overgrazing has seriously damaged vegetation, resulting in the loss of a large number of fertile soil and the reduction of cultivated land area every year. At the same time, the forest is doomed. In order to build more pastures, many trees were cut down. In addition, the exhaust gas from steak every year intensifies the greenhouse effect. According to statistics, methane exhaled by cattle on the earth accounts for 20% of the total methane. Ken, an animal husbandry nutritionist at Utah State University, USA. Olson said that methane is first secreted from the rumen of cattle (the first stomach of ruminants), then enters the circulatory system, and finally exhales from the lungs, while a small part is excreted through burping. Although methane will decompose if it stays in the air for a short time, it makes one of the main gases causing the "greenhouse effect" more powerful than carbon dioxide. According to scientists. 16% cattle feed is converted into methane in vain, which is a great waste. It seems that eating less beef is also very environmentally friendly!