The toxicity of organic pigment has become ecological concern.

有机颜料是否具有毒性已成为人们关注的一个焦点。

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Concern over natural ecological environment and cultural landscape is an important research subject of landscape ecology.

对自然生态环境和人类文化景观双重属性的关注是景观生态学的重要研究课题。

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Odorous compounds are of environmental concern because of their adverse effects on ecological environment and human health. They can cause health symptoms even in very small amounts.

恶臭污染物不仅对生态环境造成影响，而且严重危害着人体健康，恶臭污染已被列为七大环境公害之一。

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But if they can, they would cause more, not less, concern about the ecological effects of road-building.

ECONOMIST: Road kill

Protect and restore the integrity of Earth's ecological systems, with special concern for biological diversity and the natural processes that sustain life.

CNN: Earth Charter sets course for sustainable living