减少大气层中的二氧化碳含量极其重要。
Reducing levels of carbon dioxide in the atmosphere is of critical importance.
事实上，研究表明40亿年前大气中的二氧化碳含量远远高于今天的水平。
In fact, studies indicate that four billion years ago, carbon dioxide levels in the atmosphere were much higher than today's levels.
虽然在冰川消退期间二氧化碳含量的变化与温度的变化密切相关，但它显然滞后于冷却期间的温度。
Although change in carbon dioxide content closely follows change in temperature during periods of deglaciation, it apparently lags behind temperature during periods of cooling.
与此同时，空气中的二氧化碳含量正迅速接近政府间气候变化专门委员会（IPCC）提出的上限。
In the meantime, the amount of CO2 in the air is rapidly approaching the limits proposed by the Intergovernmental Panel on Climate Change (IPCC).
当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。
Volunteers were told to think about yawning, while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.
当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。
Volunteers were told to think about yawning while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.
你可能认为火星足够温暖，可以生存；然而，火星的大气非常稀薄，二氧化碳含量超过95%。
You may think Mars is warm enough to live; however, the atmosphere is very thin with CO2 over 95%.
二氧化碳含量的增加意味着有更多的二氧化碳分子吸收红外线辐射。
An increase in the amount of carbon dioxide means that there are more molecules of carbon dioxide to absorb infrared radiation.
高二氧化碳含量与温暖的间冰期有关，低二氧化碳含量与寒冷的冰期有关。
High carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.
但是，当二氧化碳含量高时，叶孔收缩。
But when carbon dioxide levels are high, the leaf pores shrink.
在大冰河期，二氧化碳含量水平怎么会高呢？
How come a big ice age happened when carbon dioxide levels were high?
这就导致囚犯的血液中二氧化碳含量增高。
this causes an increase in carbon dioxide level in the individual's blood.
其后果是更高的二氧化碳含量和温度升高。
二氧化碳含量将增加到500ppm乃至更多。
在上个冰期末，二氧化碳含量增长了近50%。
At the end of the last ice age, atmospheric carbon dioxide levels shot up by nearly 50 per cent.
大气中不断上升的二氧化碳含量对珊瑚有双重作用。
Increasing carbon dioxide in the atmosphere has a double effect on coral.
但随着大气中二氧化碳含量的增加，海水变得酸性更强。
But as carbon dioxide builds up in the atmosphere, ocean water becomes more acidic.
总的看来，现在的大气中二氧化碳含量为万分之三点八七。
To put that in perspective, the current level of CO2 in the atmosphere is 387 parts per million.
如果大气中的二氧化碳含量翻倍，那么全球的平均温度便会上升。
Double the amount of carbon dioxide in the atmosphere and the average global temperature will go up.
在过去的22年中，研究中心附近的二氧化碳含量增加了12%。
Carbon dioxide levels around the research center have increased 12percent in the last 22 years.
随着大气中二氧化碳含量的增加，谷类和油料作物可能生长的更快。
Grain and oilseed crops are likely to develop faster with increased carbon dioxide in the atmosphere.
希望将大气中二氧化碳含量由百万分之380降低到百万分之350。
Want concentration of CO2 in atmosphere lowered from 380 to 350 parts per million.
拥有4千米深海洋的地球，对二氧化碳含量的变化只能作出缓慢的回应。
Earth, with its four-kilometre-deep oceans, responds only slowly to changes of carbon dioxide.
当我们燃烧化石燃料时，空气中的二氧化碳含量提高，而氧气大大减少。
As we drive up levels of CO2 by burning fossil fuels, we also deplete oxygen.
而结果是，影响史前气温转变的最大因素一直是空气中二氧化碳含量的摆动。
And as it turns out, the biggest factor affecting prehistoric temperature shifts has been fluctuating levels of carbon dioxide in the air.
我们可以亲眼观察到二氧化碳含量增加对‘海洋社会’将产生什么样的影响。
We can see for our own eyes what increasing CO2 levels do to marine communities'.
来自加利福尼亚的研究人员称这种变化是由于大气中二氧化碳含量过高造成的。
The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere.
一项新的研究发现，由于大气中的二氧化碳含量的提高，美国东部树林的生长速度越来越快。
Forests in the eastern United States appear to be growingfaster in response to rising levels of carbon dioxide in the atmosphere, a newstudy has found.
但随着大气中二氧化碳含量的增加，海水变得酸性更强。而甲壳类生物难以生成它们的甲壳了。
But as carbon dioxide builds up in the atmosphere, ocean water becomes more acidic. And shellfish have trouble growing their shells.
但随着大气中二氧化碳含量的增加，海水变得酸性更强。而甲壳类生物难以生成它们的甲壳了。
But as carbon dioxide builds up in the atmosphere, ocean water becomes more acidic. And shellfish have trouble growing their shells.
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