The researchers found the presence of carbon thirteen, a version of the carbon atom that is usually found in space.

VOA: special.2009.09.30

They should get out and clear space around the vehicle's exhaust pipe to prevent the possibility of carbon monoxide poisoning.

VOA: special.2011.01.11

They should get out and clear space around the vehicle to prevent the possibility of carbon monoxide gas poisoning.

VOA: special.2010.01.05

In Washington, the Environmental Protection Agency on Monday declared carbon dioxide and other greenhouse gases a threat to public health.

VOA: special.2009.12.12

Anyone who uses a device that burns fossil fuel must inspect the equipment carefully to reduce chances of carbon monoxide escaping.

VOA: special.2010.02.02

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

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

VOA: special.2010.01.26

The World Economic Forum will also discuss global warming, investment in low-carbon forms of energy in developing countries and other issues.

VOA: special.2009.01.23

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

It found that the average number of carbon monoxide deaths in the United States was greatest in the month of January.

VOA: special.2010.02.02

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

The most important weapon against carbon monoxide poisoning is the safe use of materials to heat any enclosed area.

VOA: special.2010.02.02

He found that mangroves store about three to four times more carbon per hectare as temperate forests or even tropical rainforests.

VOA: special.2011.05.10

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