当蓝藻刚出现时，它们释放出的氧气对于其他几乎所有种类的生命来说都是有毒的，随之产生的物种大灭绝被称为大氧化事件。
When cyanobacteria first appeared , the oxygen they breathed out was toxic to nearly all other forms of life . The resulting extinction is called the oxygen catastrophe .
大氧化事件