The hijacking became a trigger point for military action.

【trigger】这次劫持事件成了引发军事行动的导火线。

Warming above this point increases the risk of triggering major tipping points, including the death of coral reefs and the melting of polar ice sheets, which will add to sea level rise, devastating coastal communities.

全球变暖超过 1.5 度会增加多个重要临界点被触发的风险，包括珊瑚礁死亡和极地冰原融化，这会令海平面升高，给海岸居民带来毁灭性后果。