1.Another major threat is the falling numbers of insects and the extinction of many species.
extinction 滅絕
An operation is beginning to try to save a species of crocodile from extinction.
一項努力拯救一個鱷魚物種、使其免于滅絕的行動已經開始 。
2.Scientists say the apocalypse could trigger, "a catastrophic collapse of Earth's ecosystems".
collapse 崩潰
The earthquake was the occasion of the building's collapse.
地震是房屋倒塌的起因 。