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As you know it, food shortages have hit many countries in the world and even cause social unrest in some areas. But who is responsible for the current world food crisis? First, annual world grain output has declined because climate change. Then lots of farmland have been lost due to the rapid development of industry and urbanization. Then how should we do to deal with the problem? On one hand, we should focus on the environmental protection or improve the ecology. On other hand, strict measures should be taking to protect farmland. And for the moment, I think, we should study hardly to develop sciences and solve the food shortage in the future.