Airborne soot and dirt from the impact blanketed Earth, inhibiting photosynthesis and triggering mass extinctionofspecies.
撞击产生的烟尘和灰尘覆盖了地球，抑制了光合作用，引发了物种的大规模灭绝。
2
Prof. Laughlin concedes that excess carbon dioxide could – "in a handful of examples" – contribute to the extinctionofspecies.
劳克林承认，过多的二氧化碳会导致物种灭绝—可以找到一些例子。
3
It is one of the factors controlling the size of competing populations, and in extreme cases it may lead to the extinctionof one of the competing species.