Spruce bark beetles have boomed in Alaska thanks to 20 years of warm summers.

由于20年的暖夏，阿拉斯加的云杉八齿小蠹虫生长的异常旺盛。

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Bark beetles in lodgepole pine used to be more selective, leaving the younger and healthier trees alone.

海滩松上的树皮甲虫会有选择性地寄居在松树上，避开年轻健康的松树。

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In fact, spruce bark beetles have lived in Alaskan forest for nearly hundred years without causing major damage.

事实上，杉皮甲虫已经在阿拉斯加森林里生活了近百年，但是从来没有造成严重的灾害。

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In the western part of the US, pine bark beetles have thrived, partly because of changing temperatures.

BBC: Why are the world's older trees disappearing?

Bark beetles are known to attack trees already weakened by other environmental factors.

CNN: Global warming threatens forests, study says

In fact, they tend to be pretty sick, as the normal thinning from fires is suppressed, resulting in an unhealthy tree density, invasion and death from bark beetles, and then surprise a mega fire that takes down the entire woods.

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