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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The costal city becomes more and more an attractive tourism destination for people, but its ecological environment problems have already caused peoples extensive concern as follow.

沿海城市越来越成为人们的旅游首选目的地，但随之而采的城市生态环境问题已引起人们的广泛关注。

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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