几千年来，他们开始减少对野外狩猎和采集的依赖，而更多地依靠自己饲养的动物和播种的庄稼。
Over thousands of years, they began to depend less on what could be hunted or gathered from the wild, and more on animals they had raised and crops they had sown.
比如说，像大象这样的大型动物比小型动物需要更多的食物和能量，而其后代比小型动物更少。
Large animals like elephants, say, they require much more food and energy and have fewer offspring than smaller animals.
人们使用更多的能源、水和土地来饲养动物作为食物，而不是用它们来种植水果和蔬菜。
People use more energy, water and land to raise animals for food than to grow fruit and vegetables.
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