List any two causes of increase in concentration of $CO_{2}$ in the atmosphere.

(N/A) The two main causes for the increase in the concentration of $CO_{2}$ in the atmosphere are:
$(i)$ Deforestation: Trees and plants absorb $CO_{2}$ for photosynthesis. Large-scale cutting of forests reduces this absorption,leading to an increase in atmospheric $CO_{2}$ levels.
$(ii)$ Increased combustion of fossil fuels: The burning of fossil fuels like coal,petroleum,and natural gas for energy,transportation,and industrial activities releases large amounts of $CO_{2}$ into the atmosphere.