Which one of the following is considered to be the optimum concentration of carbon-dioxide for natural balance in atmosphere?

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0.03 percent. The air around us is a mixture of gases mainly nitrogen and oxygen but contains much smaller amount of water vapour, argon, carbon dioxide and very small amount of other gases. The table indicates the composition of a typical sample of air- Substance Percentage by volume Nitrogen 78.08 Oxygen 20.95 Argon 0.93 Carbon dioxide 0.033 Neon 0.0018 Helium 0.00052 Methane 0.0002 Krypton 0.00011 Dinitrogen Oxide 0.00005 Hydrogen 0.00005 Xenon 0.0000087 Ozone 0.000001

Which one of the following is considered to be the optimum concentration of carbon-dioxide for natural balance in atmosphere?

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