Where Does the Carbon Dioxide (CO2) Come from ?
479015
From so many chemical reactions you couldn't list them all here but if you mean in the context of the global warming issue we need only look at systems that release carbon that would otherwise be locked away into the environment.  The big two sources are the much talked about burning of fossil fuels.  The carbon of coal and oil are burned to form mostly CO2.  Another big source that I don't hear much about is the carbon in limestone (calcium carbonate).  We heat this up to realize a lot of CO2 to make concrete.  A lot of CO2 is released in this process.  From the limestone and from the fossil fuel used to cook it.
1123212
Not a very well phrased question.  But dissolved CO2 and O2 in water are primarily from the lifeforms inhabiting the water, such as plants, bacteria, and others.  Inorganic chemical reactions (such as volcanic activities) would also contribute to the changes in O2/CO2 balance.
7405
weel it depends. humans produse carbon dioxide for oxygen taken into the body. The human Co2 productivity in relevance to the atmosphere is somehow conciderate. We expell the gas ( Co2 ) which makes us part of the contributing factor to its presence. Our surface area to volume ratio limmit us the dirrect impact to the Co2 we produse as a result of respiration.
436514
Water and Carbon dioxide. With the help of an enzyme called carbonic anhydrase.
1002178
Carbon dioxide acts as a greenhouse gas at all altitudes. You are correct that it is heavier than air, and therefore is less prevalent at higher altitudes.
86881
CO2 is a greenhouse gas. In addition to stimulating plant growth, it keeps the greenhouse environment warmer, because it "captures" infrared radiation (heat).
957058
In the human body, the CO2 diffuses out of the mitochondria into the cytoplasm.  From the cytoplasm, it diffuses through the plasma membrane into the interstitial fluid, and into the bloodstream.  The circulatory system takes the CO2 to the lungs where it is diffused into the alveoli and is exhaled into the environment.  \n\nIn bacteria and yeast, the waste product of CO2 is simply excreted into the environment.  The CO2 getting trapped in the gluten is what makes bread rise and gives it's porous texture.  In a liquid, the CO2 is dissolved and it's what gives beer and champagne it's effervescence.
397629
i think it does, where does the carbon in the trees come from otherwise? it comes from the carbon dioxide they use in photosynthesis\n\n--\nWell not indefinitely. If you burn the trees the carbon is released again, or if they decompose the carbon is released as carbon dioxide. I think its called the carbon cycle.
758140
Oxygen is made as a result of photosynthesis only.\n\nGlucose is also made as a result of photosynthesis.\n(Or due to the breakdown of fats, or complex sugars.)\n\nCarbon Dioxide is produced as a result of cellular respiration.\n\nThe source of energy released from glucose is the bond energy between the carbons in the molecule and the reductive properties of the electrons in the bond.\n\nCellular respiration occurs is parts.\n\nGlycolysis occurs in the cell cytoplasm (cytosol).  The Krebs cycle occurs in the mitochondrial matrix.\nThe electron transport chain and oxidative phosphorylation occurs at the inner membrane of the mitochondria.
254382
The lungs excrete carbon dioxide (a waste product from metabolism)
169963
Actually, that is a somewhat simplified reaction,\nin reality, the water and Carbon Dioxide dont form directly, they form after a secondary reaction (Carbonic acid decomposing).\n\n3Na2CO3 + 2H3PO4 --> 2Na3PO4 + 3H2CO3\nH2CO3 --> H2O + CO2\n\nSo combining them,\n3Na2CO3 + 2H3PO4 --> 2Na3PO4 + 3H2O + 3CO2
427297
1: will release carbon dioxide gas from carbonates\n\n2: will produce hydrogen when reacted with metals such as iron, zinc etc.
785032
When CO2 dissolves in water it forms the weak acid carbonic acid. H2CO3. As temp of air increases the surface temp of the ocean will increase and the solubility of CO2 will increase
1074251
Simple answer: Carbon dioxide and other "greenhouse gases" get caught up in the upper levels of earth's atmosphere. When rays from the sun enter earth's atmosphere they pass through to the earth's surface and are supposed to reflect off the earth back into space but do not because the greenhouse gases trap them in the atmosphere.  This causes the earth to heat up due to the cosmic radiation in these rays.
638140
probably carbon dioxide mostly
454399
Yes, its called sublimation. It has to do with temperature and pressure. If you make CO2 (carbon dioxide) into a solid under really low temperatures and high pressure then when you take it out of the high pressure it will go directly into the gas phase.
835624
CO2. and you can also use vinegar.