农业比狩猎和采集的人均粮食产量更高，因此人们能够抚养更多的孩子。
Farming produced more food per person than hunting and gathering, so people were able to raise more children.
在非洲，冲突时期人均粮食产量平均减少大约12.5%。
In Africa, per capita food production dropped by an average of around 12.5 percent during times of conflict.
第二，如今，世界人均粮食产量高于历史上任何时期。
Second, more food is now produced per head of the world's population than at any time in history.
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