So, you have a compounded problem of the ordinary population with an additional population of newly displaced people facing these severe food shortages.

因此，不仅是普通大众，还有这些刚刚逃离家园的人都面临严峻的食品短缺问题。

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Prof Benton added that evolutionary change added an additional pressure to population management schemes, namely that it was much more difficult to reverse than ecological change.

BBC: Environmental change 'triggers rapid evolution'

With the young age of the population at that time (the US was still an emerging market, ) and additional culling of the population by World War II, not many people tapped into the social security system.

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But they show that the underlying population pressure for additional houses has become even stronger.

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