The most recent figures show the percentage to be 0.0386% and increasing by 0.0002% per annum.
The figures you quoted are rough approximations rounded to the nearest %, there are many more gases in the atmopshere than just nitrogen, oxygen and argon - there's hundreds of them altogether, some are natural, some are synthetic, some are both.
The concentration of a gas in the atmopshere is of little relevance. Sarin for example can kill at concentrations of one unit per 100 million.
The important thing about CO2 is that for millions of years it's atmospheric concentration varied between 180 and 290 parts per million by volume, in just a few decades we've released over one trillion tons of CO2 into the atmosphere and pushed levels up to 387 ppmv.
CO2, along with the other greenhouse gases such as water vapour methane and nitrous oxide, have an essential role to play in maintaining a habitable temperature on the planet. They may only exist in small quantities but remove them from the atmosphere and the planet turns to ice.
2007-10-13 12:32:18
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answer #1
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answered by Trevor 7
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The atmospheric composition on Earth is largely governed by the by-products of the very life that it sustains. Earth's atmosphere consists principally of a roughly 78:20 ratio of nitrogen and oxygen, plus substantial water vapor (a gas), with a minor proportion of carbon dioxide. There are traces of hydrogen, and of argon, helium and other "noble" gases (and of volatile pollutants). Exact measurements are difficult, except for particular locales at a particular time.
2007-10-13 11:47:51
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answer #2
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answered by jc 2
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CO2 comprises approximately 0.0383% of the atmospheric gases. This is a fact of little relevance, however, since CO2 is alone responsible for approximately 9-36% of the overall greenhouse effect (the range is due to spectral overlaps with the other greenhouse gases).
2007-10-13 12:58:49
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answer #3
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answered by SomeGuy 6
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Why Target Carbon?
http://www.physiciansforcivildefense.org/cdp/may2007.html
2007-10-14 00:01:11
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answer #4
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answered by virgil 6
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maximum in all threat no longer. initially, the atmospheric stress on Mars is extremely low (on the subject of the comparable as an altitude of 35,000m or over one hundred,000ft in the worldwide), so vegetation does no longer proceed to exist because of the fact the water in them might go with to boil even at low temperatures. 2nd, Mars has no magnetosphere, so photograph voltaic wind is truthfully waiting to strip lots of the skinny environment from it. third, the gravity on Mars is only approximately 38% that of Earth, so isn't able to hold lots of an environment.
2016-12-14 16:57:32
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answer #5
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answered by ? 4
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About .04%.
But the physics of how CO2 passes visible radiation and blocks heat makes that .04% enough to cause substantial warming. And increasing it to .06% (we're headed there relatively fast) will cause major changes that will cost us all many hundreds of billions of dollars. Details here:
http://www.reuters.com/article/scienceNews/idUSL052735320070407
http://www.ipcc.ch/SPM6avr07.pdf
2007-10-13 13:13:12
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answer #6
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answered by Bob 7
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I believe that this should be asked in public to real scientists because no one really knows but the scientists and they could tell everyone how much there is.
2007-10-17 11:35:35
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answer #7
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answered by Anonymous
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CO2 represents approximately 0.0383% of the atmosphere.
I think Argon is actually 0.934%.
2007-10-13 11:53:36
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answer #8
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answered by Tomcat 5
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nitrogen(N2), oxygen (O2), and Ar are not greenhouse gases.
CO2(0.04%) is number 5 after the highly variable water vapor (0-1%).
2007-10-13 12:13:57
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answer #9
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answered by PD 6
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0.4%
2007-10-13 12:34:13
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answer #10
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answered by A Traveling Barbarian Immortal 2
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