Feeding today's population is a challenge for an already-stressed environment.

养活今天的人口对已经很紧张的环境来说是一个挑战。

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The idea is that around the year 1800 CE the human population became large enough, around a billion people, that its activities started altering the environment.

这种想法出现于公元1800年左右，当时人口变得足够多，大约有10亿人，人类的活动开始能够改变环境。

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Finally, the population will reach a size within the carrying capacity of the environment.

最终，人口数量将达到环境承载能力范围内。

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For example,in parts of Chobe the large elephant population has actually harmed the environment.

VOA: special.2009.08.19

The result of literate population is not only people can read, to utilize tools effectively, to go through their environment.

一个有文化素养人,不仅可以阅读，可以有效使用工具，适应生存的环境。

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But it's all different degrees of terrible, if you will, because so many people in the population share that biological vulnerability and when the environment changes, we have the problems.

只要愿意,这造成的恐慌程度是不同的,因为在人群中有很多这样的群体,他们都有这种生物易损性,当环境发生变化时,就会出现问题

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With population a key influence on the environment, UNFPA says the 1994 Cairo conference on population and development linked environmental protection to individual decision-making and human rights.

BBC: 'Shortsighted' world lets population swell

Could a large portion of the working population be comfortable in that environment?

NEWYORKER: Mastering the Machine

Two years later, at the first Earth Day, its founder predicted that the greatest challenge to the environment would be population growth.

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