Humans take in oxygen and breathe out carbon dioxide.
人吸入氧气，呼出二氧化碳。
Reducing levels of carbon dioxide in the atmosphere is of critical importance.
减少大气层中的二氧化碳含量极其重要。
Burning fossil fuels releases carbon dioxide into the atmosphere.
燃烧化石燃料会向大气中排放二氧化碳。
All things considered, I think every country should cut the emission of carbon dioxide to protect the earth.
总而言之，每一个国家都应该减少二氧化碳排放量来保护地球。
Last time we talked about photosynthesis, the process by which plants use light to convert carbon dioxide and water into food.
上次我们讨论了光合作用，即植物利用光将二氧化碳和水转化为食物的过程。
In fact, studies indicate that four billion years ago, carbon dioxide levels in the atmosphere were much higher than today's levels.
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。
The technology raises the prospect of Britain becoming self-sufficient in renewable energy and drastically reducing its carbon dioxide emissions.
这项技术提高了英国在可再生能源方面实现自给自足和大幅减少二氧化碳排放的前景。
In Earth's earliest atmosphere, methane and carbon dioxide occurred at much higher levels than at present-a circumstance that was favorable for early life.
在地球最早的大气层中，甲烷和二氧化碳的含量比现在要高得多，这对早期生命来说是有利的。
Volcanic carbon dioxide in Earth's early atmosphere kept Earth warm enough for life to begin during the time when the Sun was too dim to provide much warmth.
地球早期大气中的火山二氧化碳使地球足够温暖，保证生命在太阳过于昏暗而无法提供足够热量的时候能够得以孕育。
When our Sun later became hotter, the continued removal of atmospheric carbon dioxide and methane by early bacteria kept Earth's climate from becoming too hot to sustain life.
当我们的太阳后来温度变得更高时，早期细菌持续清除大气中的二氧化碳和甲烷，使地球的气候不至于变得太热而无法维持生命的存在。
Rainforests are the lungs of the planet storing vast quantities of carbon dioxide and producing a significant amount of the world's oxygen.
雨林是地球之肺，储存了大量的二氧化碳，并为世界生产了大量的氧气。
It's not just carbon dioxide that feeds a forest.
森林所需的并不仅仅是二氧化碳。
Gas power emits just half the carbon-dioxide of coal.
天然气的二氧化碳排放量只有煤的一半。
When carbon dioxide dissolves in water it forms carbonic acid.
二氧化碳在水中溶解后会形成碳酸。
A constant flow of air keeps the plants bathed in carbon dioxide.
室内空气保持不停流动，确保作物随时“沐浴”在二氧化碳之中。
A key player in champagne's taste is its dissolved carbon dioxide.
香槟酒之所以美味，溶解在酒中的二氧化碳功不可没。
Photosynthesis creates plant matter out of carbon dioxide and water.
光合作用把二氧化碳和水转化成植物生长所需物质。
Another way would be growing algae in the ocean to suck up carbon dioxide.
另外一种办法是可以通过在海洋里种植藻类来吸收二氧化碳。
"Carbon dioxide: they call it pollution; we call it life," runs the slogan.
广告的口号是：“二氧化碳：他们把它称为污染；我们把它叫做生活。”
Trees take in carbon dioxide from the air and make oxygen. That's important.
树木可以吸收二氧化碳，并释放氧气，这非常重要。
The long journey to cut carbon dioxide emissions can start in the here and now.
削减二氧化碳的漫漫长路现在就可以开始了。
Get the blood flowing and the carbon dioxide out and bring in healthy new oxygen.
让血液流动起来，让二氧化碳呼出去，换进新鲜健康的氧气。
Artificial trees could soak up carbon dioxide from the air using a chemical process.
人造树可以通过化学反应吸收二氧化碳。
Photosynthesis by phytoplankton removes carbon dioxide from the air and produces oxygen.
浮游植物通过光合作用消耗空气中的二氧化碳产生氧气。
The MIT team's biological system captures carbon dioxide at a higher rate, says Barbero.
麻省理工学院的研究小组所创造的生物学系统能够更快更高效地捕获二氧化碳，巴贝罗如是说。
Through photosynthesis plants use sunlight to convert water and carbon dioxide into sugar.
植物通过光合作用，利用阳光把水和二氧化碳转化为糖分。
Green plants capture carbon dioxide through photosynthesis and store carbon in their tissues.
绿色植物通过光合作用吸收二氧化碳，并把碳储存在组织内。
He said that UNEP is delighted at the gradual reduction of carbon dioxide emissions in China.
他说，环境规划署高兴地看到中国二氧化碳排放量正在逐年下降。
Some plant trees to soak up carbon dioxide. Others prevent existing trees from being chopped down.
有些组织种植树木吸收二氧化碳，有些则保护现存树木免遭砍伐。
Some plant trees to soak up carbon dioxide. Others prevent existing trees from being chopped down.
有些组织种植树木吸收二氧化碳，有些则保护现存树木免遭砍伐。
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