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What is Carbon Dioxide?

Mary McMahon
Updated Jun 04, 2024
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Carbon dioxide (CO2) is an inorganic chemical compound with a wide range of commercial uses, from the production of lasers to the carbonation of soft drinks. This compound exists naturally in the Earth's environment, and it is produced in a variety of ways; commercial CO2 is usually derived from the byproducts of industrial processes. The simple gas has become a topic of interest for humans because it is classified among the greenhouse gases, which impact the Earth's environment when they reach high concentrations in the atmosphere.

This compound takes the form of two oxygen molecules covalently bonded to a single carbon molecule. It is produced through decomposition of organic materials as well as through respiration and combustion. The amount of carbon dioxide in the environment prior to the beginning of the 20th century were kept stable by plants, which are capable of absorbing this gas as it was produced for use in photosynthesis.

As early as the 1600s, people were beginning to think about carbon dioxide, although they didn't know what to call it. Flemish chemist Jan Baptist van Helmont made observations which hinted at its existence, setting the stage for breakthrough work in the 18th century by Joseph Black, a Scottish chemist who identified the compound and explored many of its properties. By the 1800s, people had succeeded in creating and studying many of its forms.

At room temperature, carbon dioxide takes the form of an odorless, colorless gas that is incombustible in normal conditions. It can be forced into a solid form, in which case it is known as dry ice, and the gas is toxic to animals in high concentrations. People who inhale too much essentially suffocate, ultimately falling into unconsciousness as their oxygen saturation level drops.

This gas is used for things like creating an inert environment for welding, fire suppression, and the carbonation of beverages. It is an important part of the carbon cycle, a complex cycle that underlies many of the mechanics of life on Earth. While this gas is entirely natural, some people began to be concerned about rising levels towards the end of the 20th century. Scientists became concerned that humans were producing too much of the compound for plants to process, a practice that could potentially lead to serious environmental problems.

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Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a All Things Nature researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments
By anon304744 — On Nov 21, 2012

Does carbon dioxide produce particulates?

By anon193122 — On Jul 04, 2011

This helped. Thanks.

By anon180653 — On May 26, 2011

what does carbon do to the earth?

By anon163432 — On Mar 27, 2011

I agree with post 28 and post 22 mainly because there hasn't been any noticeable temperature rises in my neighborhood, plus even if the temperature is rising in other areas, that's natural for earth, according to history itself.

By anon160482 — On Mar 16, 2011

carbon dioxide is only in minute trace elements in our atmosphere. The atmosphere is composed of 78 percent nitrogen, 21 percent oxygen, less than 1 percent argon and minute traces of several other elements. So carbon dioxide does not cause a problem. --anon 67

By anon158554 — On Mar 07, 2011

Nature -- that's what it is. Trees and plants breathe in carbon dioxide and breathe out oxygen. Humans breathe in the oxygen and breathe out the carbon dioxide. And so it goes. Stop burning down the forests and plant more trees. Problem solved.

By anon158175 — On Mar 06, 2011

I use it in small doses to subdue my Parrots when clipping nails, trimming beaks and minor surgery. great stuff.

By anon157218 — On Mar 01, 2011

What a lot of baloney. Kept stable in the last century by trees. Were there no volcanic explosions then?

By anon154673 — On Feb 21, 2011

I agree with the first part of post 22. other websites will explain why global warming isn't happening.

By anon153276 — On Feb 16, 2011

I don't think carbon dioxide is the cause for global warming. Heck! I don't even think there is any global warming. But could it be possible if most of the plant life is killed off in let's say a nuclear war?

By anon149995 — On Feb 06, 2011

in reading above it says co2 is an inorganic compound. if something has carbon, doesn't that by definition make it an organic compound?

By anon149993 — On Feb 06, 2011

co is carbon monoxide its given off in fuel combustion in car exhaust, furnace, wood stove. co2 carbon dioxide is what we breath out after we take in o2. plants then take in co2 and give back O2 or oxygen.

so we need plants to get rid of co2 and give us o2. does anyone know how we get rid of co carbon monoxide.

By anon144489 — On Jan 19, 2011

i agree with post 15. plus, i love this website. i will use it every time i need to research things for science class.

By anon124818 — On Nov 07, 2010

The classification of Carbon Dioxide as a pollutant is the basis for most of our economic, political and social problems.

By anon111892 — On Sep 18, 2010

What is the difference between CO2 and CO

By anon105481 — On Aug 20, 2010

i love this website. it really, really, really helped me. thanks a lot and again thank you.

By anon78973 — On Apr 20, 2010

this helped me with my project.

By anon71299 — On Mar 18, 2010

thanks. This was helpful for my project.

By anon55283 — On Dec 06, 2009

Why would you even think of that?

By stare31 — On Nov 06, 2009

Carbon dioxide is plant food.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

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