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List any three human activities which wo...

List any three human activities which would lead to an increase in the carbon doxide content of air .

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Three human activities are :
* Burining of fuels in various processes like heating , cooking transporattion and industry .
Human induced forest fires
The process of deforestation includes the cutting down of tree. This decreases the uptake of carbondioxide for photosyn thes is. Eventually the content of carbon doxide increases.
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