To mitigate environmental problems, in recent decades some countries have developed a variety of market-oriented policy tools, such as environmental taxes, fees, or emission trading.

为了减轻环境问题，在近数十年来，一些国家已经制定了以市场为导向的政策工具，如环境税、费，或排放交易等。

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To mitigate environmental problems, in recent decades some countries have developed a variety of market-oriented policy tools, such as environmental taxes, fees, or emission trading.

为了减轻环境问题，在近数十年来，一些国家已经制定了以市场为导向的政策工具，如环境税、费，或排放交易等。

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