雅典当地官员称这次大火是一次生态灾难。
The greater Athens local governor has called the fire an ecological disaster.
墨西哥湾漏油事件人类追逐利益而引发的第一次生态灾难，当然也不会是最后一次。
The Gulf of Mexico oil spill is an ecological disaster caused by humanity's pursuit of profit - but it will not be the last.
化石研究人员已经发现的古海洋生态系统残骸，是出现在迄今为止，地球历史上最为严重的一次生物灭绝中。
Fossil hunters have uncovered the remains of an ancient Marine ecosystem that arose in the aftermath of the most devastating mass extinction in Earth's history.
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