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。

麻省理工公开课 - 媒体、教育、市场课程节选

She says different countries need different solutions based on location,environment, climate and population needs.

VOA: special.2009.07.28

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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