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

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。

麻省理工公开课 - 固态化学导论课程节选

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。

全球变暖和发达国家 - SpeakingMax英语口语达人

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

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。

麻省理工公开课 - 固态化学导论课程节选

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

The main goal of the respiratory system is to bring fresh in so that you can extract oxygen from it, and blow used air out so that you can rid of carbon dioxide which is the end product of carbon metabolism inside our bodies.

呼吸系统的主要功能是,吸入新鲜空气,以便获得空气中的氧气,呼出废气,以便排出二氧化碳,二氧化碳是人体内碳代谢的终产物

耶鲁公开课 - 生物医学工程探索课程节选

Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy.

VOA: special.2010.01.26

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。

麻省理工公开课 - 固态化学导论课程节选

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

A carbon footprint is the amount of carbon dioxide pollution that we produce as a result of our activities.

VOA: special.2011.04.05

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

However,each time a plant takes in one molecule of carbon dioxide gas, it loses hundreds of water molecules.

VOA: special.2010.01.26

A new report says mangrove forests store more planet-warming carbon dioxide than almost any other ecosystem on Earth.

VOA: special.2011.05.10

The process releases some carbon dioxide, but Rajan Vempati says it would be reabsorbed into the soil naturally.

VOA: special.2009.12.01

Experts say some methods of tilling turning the soil to prepare for planting also release harmful carbon dioxide.

VOA: special.2010.01.05

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

The researchers added carbonic anhydrase genes to plants that do not react to higher levels of carbon dioxide.

VOA: special.2010.01.26

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

For example,Mister Venter is working to design cells that can make it easier to capture carbon dioxide.

VOA: special.2010.07.20

But cement manufacturing produces around five percent of the carbon dioxide released by human activity worldwide.

VOA: special.2009.12.01

The carbon dioxide enters the plants through tiny holes or pores on the surface of leaves.

VOA: special.2010.01.26

They capture and store carbon dioxide, so experts say they can help fight climate change.

VOA: special.2010.04.20

Carbon dioxide is one of the gases that may affect the climate by trapping heat.

VOA: special.2009.12.01

The gas is mainly methane. It produces half the carbon dioxide of other fossil fuels.

VOA: special.2009.10.23

Carbon dioxide is released in cement manufacturing when fuel is burned and limestone is heated.

VOA: special.2009.12.01

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

Other threats include human pollution, acidification from carbon dioxide and rising temperatures in Earth's atmosphere.

VOA: special.2009.05.12

Rajan Vempati thinks rice hull ash could help the concrete industry produce less carbon dioxide.

VOA: special.2009.12.01

Some plants' pores can tighten to save water during conditions of high carbon dioxide.

VOA: special.2010.01.26