A few years ago, the US Forest Service studied trees in Chicago.

几年前，美国林业局在芝加哥研究树木。

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Another reason, experts say, is related to the century-long policy of the US Forest Service to stop wildfires as quickly as possible.

专家们表示，另一个原因与美国林业局长达一个世纪的政策有关，即尽快扑灭野火。

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In 2015, the US Forest Service for the first time spent more than half of its $5.5 billion annual budget fighting fires—nearly double the percentage it spent on such efforts 20 years ago.

2015年，美国林务局首次使用55亿美元年度预算的一半以上用于灭火——这几乎是20年前火灾支出所占比例的两倍。

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Ever since the fire went out, the US Forest Service has been pushing an ambitious salvage logging plan for the area.

NPR: Study: Salvage Logging Boosts Forest-Fire Threat

Dreamt up by a US Forest Service employee in 1978, the Tahoe Rim trail is a relative new entry on the hiker's to-do list.

BBC: Lost in paradise

Meanwhile, the US Forest Service has been deriving cellulose nanocrystals from wood pulp extract to create a material that's stronger than Kevlar and carbon fiber.

ENGADGET: Inhabitat's Week in Green: fluorescent bulb moon, fuel-efficient supersonic jet and a toxin-eating oyster park