答案:
Food Shortage
From the very interesting cartoon, we can see people are crowding the earth, while food on earth is far from enough to feed the surprisingly increasing population.
As we know, food shortage has hit many countries in the world and even caused social unrest in some areas. There are many reasons for the current world food crisis. First, annual world grain output has declined because of climate change. Besides, lots of farmland has been lost due to the rapid development of industry and urbanization.
Then what should be done about the problem? Firstly, we should focus on the environmental protection and improve the ecology. Secondly, stri
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