1. Those small factories are causing a lot of environmental pollution with all their noise and smoke.
    那些小工厂噪声大，烟尘多，造成严重的环境污染。

1. 自然环境保护的;生态环境保护的；环保的
    Environmental means concerned with the protection of the natural world of land, sea, air, plants, and animals.

    e.g. ...economic and environmental legislation.
           经济和生态环境保护法规
    e.g. ...the environmental claims being made for some products...
           要求一些产品注重保护生态环境的主张

2. 与周围环境有关的;由生存环境引起的
    Environmental means relating to or caused by the surroundings in which someone lives or something exists.

    e.g. It protects against environmental hazards such as wind and sun...
           它可以保护免受风、太阳等环境因素的危害。
    e.g. The form the human family takes is a response to environmental pressures.
           人类的家庭形式是为了应对来自生存环境的压力。

1. concerned with the ecological effects of altering the environment

    e.g. environmental pollution

2. of or relating to the external conditions or surroundings

    e.g. environmental factors