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Countries cannot have it both ways: the cost of a cleaner environment may sometimes be fewer jobs in dirty industries.

各国不能二者兼得：环境更为洁净的代价有可能是污染工业的减少。

《柯林斯英汉双解大词典》

Then again, perhaps the quest for a cleaner environment shouldn't rely on the hunt for a game-changing technology.

也许对于清洁环境的追求，不应该仅仅指望某项能改变游戏规则的科技。

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Lawmakers in Washington seemed to have understood the public demand for a cleaner environment.

VOA: special.2010.04.21

At demonstrations in Atlanta,Georgia,and Miami,Florida people protested to demand a cleaner environment.

VOA: special.2010.04.21

Acquiring this simple and non-polluting form of electric light,he points out, promotes education, public health,economic security and a cleaner environment.

VOA: standard.2009.12.13

But will high oil prices lead to the goal of greater efficiency and a cleaner environment?

NPR: Will Pricey Fuel Prompt Greener Energy Habits?

But lest hybrid owners get too cocky about their individual contribution to a cleaner environment, consider this sobering observation.

NPR: The Prius Rules Hybrids �� but Is Interest Falling?

The equipment you see along that wall is actually the operator side of significantly larger machines mainly situated on the cleaner environment.

FORBES: What's It Like in a Semiconductor Fab?