how much co2 is in the atmosphere?
370942
the atmosphere is contains about 380ppm CO2 (.038%) which is up from about 280ppm (.028%) which is what is is estimated at 100 year ago. Water is still by far the majority green house gas though.
863625
Oxygen, Carbon Dioxide, and Water
827581
The Earth's atmosphere has no definite boundary, slowly becoming thinner and fading into outer space. Three-quarters of the atmosphere's mass is contained within the first 11 km of the planet's surface. This lowest layer is called the troposphere. Further up, the atmosphere is usually divided into the stratosphere, mesosphere, and thermosphere. Beyond these, the exosphere thins out into the magnetosphere (where the Earth's magnetic fields interact with the solar wind). An important part of the atmosphere for life on Earth is the ozone layer.\n\nThe atmospheric pressure on the surface of the Earth averages 101.325 kPa, with a scale height of about 6 km. It is 78% nitrogen and 21% oxygen, with trace amounts of other gaseous molecules such as water vapor. The atmosphere protects the Earth's life forms by absorbing ultraviolet solar radiation, moderating temperature, transporting water vapor, and providing useful gases. The atmosphere is one of the principal components in determining weather and climate.\n\nBecause hydrogen gas is light and based on Earth's mean temperature, achieves escape velocity, unfixed hydrogen leaves the Earth. For this reason, the Earth's environment is oxidizing, with consequences for the chemical nature of life which developed on the planet.\n\nYou could get more information from the link below...
228649
CO2 + H2O + light = C6H12O6 + O2
912145
CO2 - the carbon atoms possibly are derived from hydrocarbons in food, and the oxygen atoms are, of course, from the atmosphere.
774815
CH4 + 2 O2 ---> CO2 + 2 H2O
108902
The atmosphere reaches over 560 kilometers (348 miles) from the surface of the Earth
449167
One of the major gases is inert-Argon, and doesnt really seem to cycle-it makes up about 1%.  The primary gas is nitrogen, a small amount of which is fixed in the roots of plants (or by symbiotic organisms in those roots) and lifeforms such as blue-green algae-it makes up about 78%.  The greatest cycling gas is oxygen, which makes up about 21%.  Free oxygen, as found in our atmosphere, is extremely rare and likely would not be found in the absence of life-Oxygen in very reactive-many elements and compounds readily oxidize, such as iron turning to rust.  On Earth, plants take in carbon dioxide and split it, using the carbon to build things such as carbohydrates- the oxygen is releases, and used by aerobic lifeforms for respiration.  The level of carbon dioxide is about 0.1%- This is also very unusual, since in other planets with an atmosphere, carbon dioxide is a major gas...again, low CO2 is probably a sign of life.  The CO2 is low because the plants use it-it is returnd to the atmosphere by respiration.
692559
The air that we breathe...\nOxygen, carbon dioxide, water vapour, neon gas... dissolved in the solvent of nitrogen.
666651
Well, according to the link below, humans exhale about 1 kg of CO2 every day.  They got that info from Oak Ridge National Lab, so it should be pretty accurate.\n\nSo, for an 80 year old person:\n80 years * 365 days/year * 1kg CO2/day = 29200 kg CO2\n\nPeople always get so hostile at estimation questions like this, and I don't understand it.  I think this was a perfectly reasonable question, and it was easy enough to answer with a little logical thinking.  Good scientists and engineers should ask and be able to answer questions like this.
265731
Carbon dioxide (which is emitted form cars) is the major gas from gases contribute to greenhouse effect, other gases cuase this effect like water vapor, methane, nitrous oxide,and CFC's
932725
N2: about 78%\nO2: about 21%\nAr: about 0.9%\nMisc.--includes CO2, nitrogen oxides, SO2, Xe, Kr, Ne, etc: about 0.1%
62789
On average it’s about 4,250 gallons of air per day. That equals something like 40 billion trillion molecules of oxygen. But the air brings with it roughly 20 billion particles of dirt and other foreign matter.  To get “per life” amount take 4,250 x 365 x life expectancy in years.
935102
Your question is ambiguous because air is a mixture of gases including carbon dioxide. Earth's atmosphere, "air", contains roughly 78% nitrogen and 21% oxygen and 0.93% argon, trace amounts of other gases, and water vapor.\n\nIf you wished to remove carbon dioxide from air, you could use what is called a "scrubber". Famous use of this device was in the movie "Apollo 13". \n\nMaybe you could rephrase your question if this answer does not help you...
272577
Carbon dioxide, because that is the raw material required for photosynthesis
904836
carbon dioxide from the air combining with ribulose 1,5 bisphosphate
960492
Carbon dioxide is food for plants, more CO2, more assimilation.