Soil erosion is prevented by

Aerosols reduce primary productivity by

Assertion: Presently,the global atmosphere is warming up.
Reason: The depletion of the stratospheric ozone layer has resulted in an increase in ultraviolet radiations reaching the earth.

Select the appropriate option for $FOAM$.

Match the following columns:

Column-$I$	Column-$II$
$(p)$ Catalytic converter	$(i)$ Foam
$(q)$ Marsh land	$(ii)$ Powder of plastic
$(r)$ Polyblend	$(iii)$ Air pollution
$(s)$ Elnino effect	$(iv)$ Deforestation
$(t)$ Chipko movement	$(v)$ Green House effect

When did the worst environmental nuclear power plant accident and the $MIC$ gas tragedy occur,respectively?