List any three human activities which would lead to an increase in the carbon dioxide content on air.
Human activities which are responsible for adding carbon dioxide to the atmosphere are
1. Respiration Both plants and animals release carbon dioxide to the atmosphere as a product of respiration.
2. Decomposition Decomposition of organic wastes and dead bodies by decomposer releases carbon dioxide to the atmosphere.
3. Combustion Burning of fossil fuels, like wood, coal, petrol, gas and kerosene also releases carbon to the atmosphere.

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