As we all know, food shortages have influenced many countries in the world. We should pay attention to the World Food Crisis. There're some reasons to explain the current situation. To begin with, due to the great climate changes, the output of world grains has declined annually. Furthermore, the industry is developing rapidly, which caused the transform from farmland into industrial land. Besides, the fast urbanization is also responsible for the decrease of farmland. Last but not least, nowadays the world energy prices are rising, people would like to use biofuels, which nakes the current situation even worse.