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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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