来自《耶鲁大学开放课程：有关食物的心理学、生物学和政治学 第10集》
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At some point the population demands总会在某一时候 人们的需求增长 -
will outstrip our ability to produce more food,会超过我们食物能力的增长 -
because there's only so much land in the world因为世界上就这么一点儿 -
where food can be grown.适合食物生长的耕地 -
The productivity has gone up, and up, and up生产力不断的增长 增长 再增长 -
and is starting to plateau in certain parts of the world,已经开始接近现实世界的最高点 -
so at what point does this really become a crisis?那么何时危机才会真正来临呢 -
Some estimates are that in the next forty years一些看法认为在未来的四十年 -
the world population will reach a number like this;世界人口数量将会达到这个数 -
this will require triple the current food production,那就需要将现有食品生产量翻三倍 -
and this requires a ten-fold increase in energy而这则需要十倍的能源增长 -
because of the expected declines in crop yield因为可以预见粮食产量会因耕地减少