Answer:
Carbon dioxide is a natural
constituent of atmosphere and is vital for all forms of plant life. It forms
about 0.033% by volume of atmosphere. It helps to maintain the temperature of
the earth required for the living organisms.
A balance of \[C{{O}_{2}}\]is
maintained in air because \[C{{O}_{2}}\] is produced from respiration, burning
of fossil fuels and decomposition of lime stone but at the same time it is consumed
in photosynthesis by plants.
However, human activities have
disturbed this balance and\[C{{O}_{2}}\] level in atmosphere is in increasing
order. This has happened due to deforestation, burning of more of fossil fuels
and industrialization. It has been estimated that \[C{{O}_{2}}\]concentration
has risen about 25% in the past century. During the past nearly 120 years, the
average temperature of the planet has increased by somewhere between 0.4 and\[0.8{}^\circ
C\]. Current estimates are that doubling the \[C{{O}_{2}}\]concentration will
result in a temperature increase of between 1.0 and\[3.5{}^\circ C\]. The
greenhouse effect contribution of \[C{{O}_{2}}\] is 50% and of other trace
gases is also about 50%.
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