(N/A) Carbon dioxide is a natural component of the atmosphere and is essential for all forms of plant life. It constitutes approximately $0.033 \%$ of the atmospheric volume and helps maintain the temperature necessary for life.
The concentration of $CO_{2}$ in the atmosphere is maintained because it is released during respiration,combustion of fossil fuels,and decomposition of limestone,while simultaneously being consumed by plants during photosynthesis.
However,human activities disturb this balance,leading to an increase in atmospheric $CO_{2}$ levels. This is caused by excessive use of fossil fuels,deforestation,and industrialization.
It is estimated that the concentration of $CO_{2}$ has increased by approximately $25 \%$ in the last century.
Over the last $120$ years,the Earth's temperature has risen by approximately $0.4^{\circ} C$ to $0.8^{\circ} C$.
Current estimates suggest that doubling the concentration of $CO_{2}$ will lead to a temperature increase of $1.0^{\circ} C$ to $3.5^{\circ} C$. $CO_{2}$ contributes about $50 \%$ to the greenhouse effect,while other gases contribute the remaining $50 \%$.