科学家称，环保人士对灭绝物种的数量估计过高。
Conservationists are overestimating the number of species that have been driven to extinction, scientists have said.
市场中普遍见到的野猪是一个数量正在衰减的物种，绒毛猴也一样濒临灭绝。
The peccary that was most commonly traded is a species in decline and the woolly monkey is threatened with extinction.
生产如此数量的粮食可能大大提高环境中二氧化碳和氮的水平，引起很多物种的灭绝。
Producing that amount of food could significantly increase levels of carbon dioxide and nitrogen in the environment and cause the extinction of numerous species.
过去，大气中的二氧化碳的增加和提高的温度实际驱动产生了更多新植物物种，其数量远远大于灭绝的物种数量。
In the past, rising atmospheric carbon dioxide and higher temperatures actually drove the evolution of far greater Numbers of new rainforest plant species than were wiped out.
该部门年度鸟类报告的最新数据显示，美国大约800个鸟类物种的三分之一由于种群数量减少而濒临灭绝。
The latest version of the department's annual State of the Birds report shows that nearly a third of the nation's 800 bird species are endangered, threatened or suffering from population decline.
当一个物种的种群数量稀少而又不得不近亲繁殖时，灭绝就会发生。
And this is what happens with small populations and inbreeding of close relatives.
研究人员记录了会导致灭绝风险的物种数量变化事件，在这些事件中，物种的数量快速降到零。
The researchers documented changes to extinction risk, where species are moving most rapidly toward zero population.
由于个体种化石的的数量统计随着时间的推移而变化，研究生物灭绝的古生物学家们更倾向于对称为类的有相互联系的整个物种种群进行统计研究。
Rather than counting individual species of fossils,which vary over time, palaeontologists who study extinction usually countentire groups of related species, called genera.
他们认为，近年来，许多动物物种数量的急剧减少，像青蛙、鱼类和老虎等等，其锐减速度赶得上过去5亿4千万年以来五次大规模物种灭绝的任意一次。
They believe that the steep decline in populations of many animal species, from frogs and fish to tigers, is as fast as any of the last five extinctions in the past 540 million years.
人口数量大幅减少，也许90%的物种会灭绝，情况堪与地球45亿年历史中最严重的大规模灭绝匹敌。
Human population is drastically reduced. Perhaps 90% of species become extinct, rivalling the worst mass extinctions in the Earth's 4.5 billion-year history.
这项研究表明，在今后短短三代人的时间内，以目前的灭绝速度足够可以显著和永久地改变地球上物种的数量。
In as little as three generations, the current pace of extinction could dramatically and permanently alter the number of species on the planet, the study said.
通过对被保护物种生存环境的分析是探知该物种灭绝和种群数量下降的重要手段。
The survival environment analysis to protected species is the important means to detect the population decline and extinction reasons.
人类不会造成灭绝，亲爱的，因为每一物种控制着每一年新生儿的数量，即使是在有毒物质或人类人口数量对我们地域的占据的作用中。
Humanity does not cause extinction beloved, as each species controls the Numbers born each year, even in lieu of toxic substances or human populations overrunning our territory.
研究表明：“上个世纪灭绝的物种数量本应该用800年到10,000年的时间才会消失的。”
"The number of species that have gone extinct in the last century would have taken... between 800 and 10,000 years to disappear," the study reported.
隆伯格一再地以比例来谈灭绝物种的数量，他只是想说明问题的规模呢，或者是大事化小、小事化无的手法呢？
When Lomborg restates the number of lost species as a percentage of total species, is he simply showing the true size of the problem or is he perhaps also trying to trivialize it?
雌性恐龙变得非常稀少，导致越来越少幼恐龙的出生，以致这个物种数量日渐稀少，直至灭绝。
Females become rare, causing fewer young dinosaurs to be born and species to dwindle to extinction.
地球出现生命以来，生物物种数量动态增长，但随着人类活动的出现，生物物种灭绝速度逐渐加快。
Since life appeared on earth, biological species grew dynamically. However, the speed of species extinction is gradually accelerating as human being came to dominance.
地球出现生命以来，生物物种数量动态增长，但随着人类活动的出现，生物物种灭绝速度逐渐加快。
Since life appeared on earth, biological species grew dynamically. However, the speed of species extinction is gradually accelerating as human being came to dominance.
应用推荐