是什么导致了如此高的物种灭绝率？
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。
This is the story of wildlife conservation in the age of mass extinction.
因此，许多科学家得出结论，第六次大规模物种灭绝正在发生。
Many scientists have therefore concluded that a sixth great mass extinction is currently in progress.
物种灭绝的速度不断加快，已经敲响了警钟。
The rate of species extinction is accelerating to dangerous levels.
越来越多的物种灭绝每年驱动。
More and more species are being driven to extinction every year.
如果这些物种灭绝······会有什么差别呢？
l我们是不是欠下了一笔物种灭绝的债？
物种灭绝是一种自然现象。
有些物种灭绝了。
在土地使用的变化可能导致生境和物种灭绝的损失。
Changes in land use may result in loss of habitat and extinction of species.
灭绝何时发生？历史上导致物种灭绝的原因是什么？
When does it happen and what "s the drive force of extinction in history?"
然而，避免第六次物种灭绝的机会窗口正在迅速关闭。
因此在土壤肥沃的地方，长得快的物种令生长缓慢的物种灭绝。
So in rich soils, slower species die out while the fast-growers win big.
外来侵害性物种会打乱生态平衡，常常导致一些当地物种灭绝。
Invasive species can and often do upset the ecological balance and wipe out local varieties.
一颗约六英里直径的陨石，被认为是造成恐龙物种灭绝的罪魁祸首。
One, about six miles across, is thought to have wiped out the dinosaurs.
成立这个协会是为了保护濒危物种不致灭绝。
The society was set up to preserve endangered species from extinction.
一个物种一旦灭绝就永远消失了。
例如，一个移居的物种可能会因缺乏食物而灭绝。
A translocated species could die out from lack of food, for example.
因栖息地正受到破坏这一物种已濒于灭绝。
This species has nearly died out because its habitat is being destroyed.
我们都知道熊猫是一种濒临灭绝的物种。
We all know that panda is a species that is on the edge of extinction.
近四分之一的植物物种有灭绝的危险。
Nearly a quarter of plant species are threatened with extinction.
我认为鲸鱼物种除了灭绝，毫无未来。
除此之外，蜥蜴灭绝模型可能还适用于其它物种。
Beyond that, the lizard-extinction model could perhaps be applied to other species.
现在假设，在这段时间里，你的宠物成为濒临灭绝的物种。
Now imagine that during that time your pet became an endangered species.
目前，越来越多的物种濒临灭绝，这是一个重大的环境问题。
The rampant loss of species occurring today is a major environmental concern.
目前，越来越多的物种濒临灭绝，这是一个重大的环境问题。
The rampant loss of species occurring today is a major environmental concern.
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