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Doctors say that over time the damage interferes with the natural exchange of oxygen and carbon dioxide in the lungs.
VOA: special.2010.06.23
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That gives us 1 mole of calcium oxide and 1 mole of carbon dioxide.
摩尔的氧化钙,和1摩尔的二氧化碳。
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And so I think we need to take action as soon as possible to start reducing carbon dioxide emissions.
所以我觉得我们需要尽快开始行动，减少二氧化碳排放。
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Mister Schroeder says that carbon dioxide levels in the atmosphere are much higher now than they were in the past.
VOA: special.2010.01.26
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And as you know, carbon dioxide is implicated as a greenhouse gas.
你知道的，二氧化碳意味着温室气体。
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They observed that for every molecule of carbon dioxide taken in by the plants, they lost forty-four percent less water.
VOA: special.2010.01.26
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We will get 100.1 g of calcium carbonate and then discover that we have 56.1 g of calcium oxide, and 44 g of carbon dioxide.
00。1g的碳酸钙,将得到56。1g的氧化钙，和44g的二氧化碳。
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Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy.
VOA: special.2010.01.26
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Their findings could help to engineer plants that grow better and more effectively in conditions with higher levels of carbon dioxide.
VOA: special.2010.01.26
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A carbon footprint is the amount of carbon dioxide pollution that we produce as a result of our activities.
VOA: special.2011.04.05
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Greenhouse gas emissions, such as carbon dioxide, are created in part by burning oil and coal for transportation and electricity.
VOA: special.2009.12.26
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However,each time a plant takes in one molecule of carbon dioxide gas, it loses hundreds of water molecules.
VOA: special.2010.01.26
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A new report says mangrove forests store more planet-warming carbon dioxide than almost any other ecosystem on Earth.
VOA: special.2011.05.10
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The process releases some carbon dioxide, but Rajan Vempati says it would be reabsorbed into the soil naturally.
VOA: special.2009.12.01
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Experts say some methods of tilling turning the soil to prepare for planting also release harmful carbon dioxide.
VOA: special.2010.01.05
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The effort will help reduce carbon dioxide releases from the Empire State Building by more than one hundred thousand tons a year.
VOA: special.2009.05.22
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The researchers added carbonic anhydrase genes to plants that do not react to higher levels of carbon dioxide.
VOA: special.2010.01.26
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For example, the insects can smell carbon dioxide in the breath of a person or animal from as far away as sixty meters.
VOA: special.2009.05.26
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For example,Mister Venter is working to design cells that can make it easier to capture carbon dioxide.
VOA: special.2010.07.20
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But cement manufacturing produces around five percent of the carbon dioxide released by human activity worldwide.
VOA: special.2009.12.01
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The carbon dioxide enters the plants through tiny holes or pores on the surface of leaves.
VOA: special.2010.01.26
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They capture and store carbon dioxide, so experts say they can help fight climate change.
VOA: special.2010.04.20
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Carbon dioxide is one of the gases that may affect the climate by trapping heat.
VOA: special.2009.12.01
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The gas is mainly methane. It produces half the carbon dioxide of other fossil fuels.
VOA: special.2009.10.23
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Carbon dioxide is released in cement manufacturing when fuel is burned and limestone is heated.
VOA: special.2009.12.01
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But he is hard at work. He and his team currently are trying to make algae that can change carbon dioxide back into fossil fuel.
VOA: special.2010.07.20
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Other threats include human pollution, acidification from carbon dioxide and rising temperatures in Earth's atmosphere.
VOA: special.2009.05.12
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Rajan Vempati thinks rice hull ash could help the concrete industry produce less carbon dioxide.
VOA: special.2009.12.01
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Some plants' pores can tighten to save water during conditions of high carbon dioxide.
VOA: special.2010.01.26
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Traditional buses that run on diesel fuel release harmful carbon dioxide and other pollutants.
VOA: special.2009.09.07
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