当一个物种灭绝时，它会极大地改变生物多样性的状况。
When a species goes extinct, it dramatically changes the landscape of biodiversity.
不管什么原因，恐龙以及地球上几乎半数以上的物种灭绝了。
Whatever the cause, dinosaurs, as well as about half of all species on the planet, went extinct.
由于引入了非本地的捕食者和病原体，已经有许多本土物种灭绝的记录，证据确凿。
There have been numerous well-documented extinctions of indigenous species caused by the introduction of non-indigenous predators and pathogens.
这种开发已经达到了如此极端的程度以至于，目前看来在本世纪末之前，将有数十万物种灭绝。
This exploitation has reached such extremes that presently it appears that some hundreds of thousands of species will be extinguished before the end of the century.
物种灭绝、森林砍伐、河流筑坝、洪水、臭氧层损耗、海洋系统恶化和许多其他变化都在加速发生。
Species extinction, deforestation, damming of rivers, occurrence of floods, the depletion of ozone, the degradation of ocean systems and many other areas are all experiencing acceleration.
克雷奇仍然认为古印度安人在灭绝上的责任即使不是主要的，也是次要的，他认为人类在其他地方造成了当地物种灭绝。
Still, Krech attributes secondary if not primary responsibility for the extinctions to the Paleoindians, arguing that humans have produced local extinctions elsewhere.
全球变暖的后果之一是物种灭绝。
是什么导致了如此高的物种灭绝率？
多年来，科学家们将物种灭绝归咎于气候变化。
For years scientists blamed the extinctions on climate change.
全球变冷之后才是全球变暖，那时还没有物种灭绝。
You know, global cooling followed by global warming, and there was no extinction then.
现今物种灭绝发生的速度和这些大规模灭绝的速度一样快。
The rates of extinction happening today are as great as the rates during these mass extinctions.
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.
在这一系列周期性物种灭绝事件里，白垩纪晚期恐龙和菊石的灭绝仅仅是其中一个比较严重的事件。
The late Cretaceous extinction of the dinosaurs and ammonoids was just one of the more drastic in a whole series of such recurrent extinction episodes.
地质记录中的其他几次大规模物种灭绝也被认为影响重大，但没有哪一次像白垩纪大灭绝那样夸张。
Several other mass extinctions in the geological record have been tentatively identified with large impacts, but none is so dramatic as the Cretaceous event.
从传统教育家的角度来看，这一结果表明，学校教育未能帮助学生思考生态系统和物种灭绝等主要科学思想。
From the standpoint of a traditional educator, this outcome indicated that schooling had failed to help students think about ecosystems and extinction, major scientific ideas.
间接相互作用导致的已知物种灭绝或破坏的情况的稀少，反映的或许不是这种灾难的罕见，而是没有去寻找或检测它们。
The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them.
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.
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？
与之前的五次相比，这次物种灭绝可谓神速。
Compared with nearly all the previous extinctions this would be fast-track.
它们至少经历了四次地球物种灭绝，一直活到了今天。
They have survived at least four planetary mass extinctions.
人类已经不是第一次将物种灭绝归因于甲烷气体的脉冲式释放。
This is not the first time a methane burp has been blamed for an extinction.
一些专家认为，海洋缺氧可能是主要海洋物种灭绝的元凶。
Some experts believe that Marine dysoxia may be responsible for major oceanic extinctions.
她说非夏威夷本土的动植物引入是促使物种灭绝的主要原因。
She said a major cause of the extinctions are plants and animals not native to Hawaii.
物种灭绝实在是太沉重了，无法做到置之不理，然后一走了之。
The idea of extinction weighs too heavily to just shrug and walk away.
物种灭绝实在是太沉重了，无法做到置之不理，然后一走了之。
The idea of extinction weighs too heavily to just shrug and walk away.
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