近些年,世界各地的玉米、糖和食用油等农产品价格纷纷上涨。食物价格爆涨,令一些欠发达国家和地区饥荒、纠纷不断,甚至引发暴乱。即便是发达国家,人们也或多或少会感觉到类似的压力。于是,第二次绿色革命的呼声便不绝于耳。食物短缺是个大问题食物为什么价格上涨,这与世界人口膨胀关系密切。人口多,肉类消耗量也大。然而,饲养肉类动物,需要付出很大的空间以及很多的饲料。据了解,一亩(约0.067公顷)土地能够生产出约 In recent years, prices of agricultural products such as corn, sugar and cooking oil all over the world have risen. The soaring food prices have caused famine and disputes in some less-developed countries and regions and even led to riots. Even in developed countries, people feel more or less similar pressures. As a result, the voice of the second green revolution will be heard. Food shortage is a big problem Why food prices, which is closely linked with the world population expansion. Population, meat consumption is also large. However, raising meat animals requires a lot of space and lots of feed. It is understood that an acre (about 0.067 hectares) of land can produce about