Which of the following is not a greenhouse gas?

Which of the following pairs of gases is the primary cause of the "Greenhouse Effect"?

The greenhouse effect refers to:

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

Which one of the following is $NOT$ caused by global warming?

Which country is the major contributor to greenhouse gas emissions in the atmosphere?