Question

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

Answer 1

The human activities which would lead to an increase in CO₂ content of air are: 

(i) Respiration is the natural way to release of CO₂ by both plants and animals. It is balanced by the release of oxygen by plants. So, it is not harmful for the environment. 

(ii) Deforestation increases the level of CO₂ in the environment. Trees carry out photosynthesis and convert CO₂ into organic compounds such as glucose, starch, etc. In their absence, CO₂ cannot be utilized. 

(iii) Combustion of fuels leads to increase in CO level in the atmosphere. Fuels are burnt to carry out activities like cooking, transportation and in industrial processes.