Killing mechanism: atmospheric dimming, acid rain, crop die-off.

杀伤机制：大气能见度降低、酸雨、作物死亡。

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The die-off was surpassed only by the gargantuan Permian extinction 250 million years ago.

只有2亿5000万年前史上空前的二叠纪大灭绝盖过这次灭绝。

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Bird and fish die-off from methane have shown these species are highly sensitive to methane poisoning.

鸟类和鱼类由于甲烷导致的大量死亡显示了这些物种对甲烷毒气的高度敏感。

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The die-off was least severe in the southern bay, where there was a 7 percent overall decrease and where new beds were found in the main stem of the James River.

WSJ: Chesapeake Bay grasses decline again

Without new conservation measures, there could be a massive die-off of Caribbean frogs within 15 years, warned Adrell Nunez, an amphibian expert with the Santo Domingo Zoo in the Dominican Republic.

NPR: Alarm Over Vanishing Frogs In The Caribbean

And four other great die-offs have been identified - one of them killing off something like 90% of species.

BBC: Why such a fuss about extinction?