科学家们正在研究发明矿物燃料的替代品；法律也制定了对有害物质排放量的限制条款；木材公司也正在进行合理化伐木等。
Science is inventing alternatives to fossil fuels; laws have been enacted to control dangerous emissions; timber companies are practicing responsible logging, and so on.
科学家们正在研究发明矿物燃料的替代品；法律也制定了对有害物质排放量的限制条款；木材公司也正在进行合理化伐木等。
Science is inventing alternatives to fossil fuels; laws have been enacted to control dangerous emissions; timber companies are practicing responsible logging, and so on.
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