Agriculture in China China has only 7 percent of tile world farmland but it successfully feeds 22 percent of the word population. It has the largest irrigated area of the fanaland in the world and grows more than a third of rice and other crops of the world. Fish farming is also important so fresh-water fish can be produced wherever you hive. Vegetable waste is used to feed pigs and chickens in the country. Gas also is produced by human and animal waste there and it is used to heating and cooking. Using waste can make the environment around us cleaner and cleaner.