What damage does vegetation cause?

$A$ : Irrigation without proper drainage of water leads to water logging in the soil.
$R$ : Water logging results in increased soil salinity.

$Ahmed \text{ } Khan : \text{polyblend} :: \text{Amrita Devi Bishnoi} :$

Soil conservation can be best achieved by having

Choose the correct option regarding the following statements:
$(1)$ $CO_2$ contribution in global warming is $60\%$.
$(2)$ Greenhouse effect occurs due to deforestation.
$(3)$ Due to the greenhouse effect,the present average temperature at the surface of the Earth is $15^oC$.
$(4)$ The amount of $DDT$ in small fish is $0.05\ ppm$.

In the given pie chart,what do $W, X, Y$ and $Z$ represent respectively?