Who is concerned with organic farming?

Match the items given in Column $I$ with those in Column $II$ and select the correct option given below:

Column $I$	Column $II$
$(a)$ Eutrophication	$(i)$ $UV-B$ radiation
$(b)$ Sanitary landfill	$(ii)$ Deforestation
$(c)$ Snow blindness	$(iii)$ Nutrient enrichment
$(d)$ Jhum cultivation	$(iv)$ Waste disposal

Provide information about Ecosan toilets.

Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of planktonic (free-floating) algae which can accelerate which of the following phenomenon?

Why is $CNG$ a better option than diesel?

$5^{\text{th}}$ $June$ is celebrated as: