Excess atmospheric $CO_2$ increases the greenhouse effect because it:

If global warming continues, the organism which may face more severe threat is

$CO_2$ is called a greenhouse gas because ......

Consider the following statements and select the correct set with respect to global warming:
$(a)$ $El$ $Nino$ effect
$(b)$ Cooling of stratosphere and earth surface
$(c)$ Shifting of climatic zones
$(d)$ Snow blindness
$(e)$ Impairment of hearing
$(f)$ Excessive deposition of ice at poles
$(g)$ Rise in sea level
$(h)$ Increase in eutrophication

The greenhouse effect is a warning because...

Select the appropriate option regarding the El Niño effect.