This is the story of wildlife conservation in the age of mass extinction.

这是个关于在大规模的物种灭绝时代保护野生动物的故事。

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Nearly a quarter of the world's land mammal species are at risk of extinction, and many others may vanish before they are even known to science, according to a major annual survey of global wildlife.

一项对全球野生动物的大规模年度调查表明，近四分之一的陆地哺乳动物物种濒临灭绝，还有许多其余的物种，甚至在科学界知道它们之前可能就已经绝迹了。

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The species is hardly at the brink of extinction: there are 23, 000 elephants in Kenya and fewer than 100 have died from the drought but wildlife experts say they are concerned.

大象这个物种还未处在灭绝的边缘：在肯尼亚生活着2.3万头大象，而这次旱灾的大象死亡数不到100，但野生动物专家们表示，目前他们十分担忧大象的处境。

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The Lady's Slipper orchid was rescued from extinction by scientists and is strictly protected by wildlife laws.

BBC: Lady's Slipper rare orchid to have Chelsea show security

"If people continue with this spate of killing nesting turtles and destroying their eggs, they'll be destroying generations of turtles and their offspring and pushing these wonderful reptiles into extinction, " says project officer of the Ghana Wildlife Society, Gerrard Osei Boakye.

BBC: volunteers pulling a turtle to safety

But after months of reporting and hundreds of bear sightings, I kept running up against an inconvenient truth: There were a lot of well-meaning, well-credentialed scientists, wildlife officers and local experts who simply didn't believe that polar bears were one ice cube away from extinction.

WSJ: Are Polar Bears Really Disappearing?