The standard of living is very badly affected by

What is the full form of $NGO$?

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

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Haryana	$(1)$ Ozone hole
$(b)$ Chernobyl	$(2)$ Integrated organic farming
$(c)$ Garhwal	$(3)$ Radioactive waste leakage
$(d)$ Antarctica region	$(4)$ Chipko movement

For the best ecological balance,what percentage of the land mass of a country in the plains should be covered with forests (in $, \%$)?

Match the following and choose the correct combination from the options given:
Column $I$ | Column $II$
$(1)$ $DDT$ | $(p)$ $CO, CO_2$
$(2)$ $PAN$ | $(q)$ Smog
$(3)$ Acid rain | $(r)$ Biological magnification
$(4)$ Global warming | $(s)$ $SO_2$