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-->Plant takes all its carbon from air as carbondioxide and then reduces it in the photosynthesis reaction and makes into sugars and so on.
Carbon makes the major part of the dry mass of all living beings.
Carbon, Oxygen and Hydrogen make >90% of a plants biomass.
Even the coal and oil industries like CO2 ->
http://www.plantsneedco2.org
I hope you realise that CO2 is also a green house gas and its warming effect is very real and simple understand.
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