Question

Mention some human activities which have affected oxygen cycle.​

Answer 1

Explanation:

It shows that due to the increasing fossil fuel combustion, overgrazing and population growth, current O2 consumption over land is far greater than O2 production from the terrestrial ecosystem, breaking the atmospheric O2 balance and causing the decline of O2 concentration in the atmosphere.

Answer 2

Carbon dioxide levels in the atmosphere can be increased by the following three human activities (anthropogenic activities):

1. The combustion of fossil fuels, such as coal, for the creation of power or for industrial purposes emits enormous amounts of CO2.

2. Vehicle exhaust fumes add to the rise in CO levels.

3. Deforestation to make way for agriculture and urbanisation causes CO2 levels to rise.

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