$DDT$ residues are rapidly passed through the food chain causing biomagnification because $DDT$ is:

The average concentration of $CO_2$ in the atmosphere is

Match the columns :

Column - $I$	Column - $II$
$(1)$ Nitrous oxide	$(a)$ Secondary pollutant from car exhaust.
$(2)$ Chlorofluorocarbons	$(b)$ Combustion of fossil fuels,wood etc.
$(3)$ Methane	$(c)$ Denitrification
$(4)$ Ozone	$(d)$ Refrigerators,aerosols,sprays
$(5)$ Carbon dioxide	$(e)$ Cattle,rice fields,toilets

Choose the correct option for the following sentences:
$(1)$ Reducing deforestation
$(2)$ Reducing the use of fossil fuels
$(3)$ Planting trees
$(4)$ Slowing down the growth of the human population.

The effect of pollution is first and most marked on:

The Chipko movement was successfully launched by