The $CO_2$ content of the atmosphere has increased in the last $150$ years from:

In the town of Arcata,the local people,in collaboration with biologists from $...........$,developed an integrated wastewater treatment process within a natural system.

Which one of the following pairs is not correctly matched?

Match the items given in column $A$ and $B$:

Column $A$	Column $B$
$(a)$ Catalytic converter	$(i)$ Particulate matter
$(b)$ Electrostatic precipitator	$(ii)$ Carbon monoxide and nitrogen oxides
$(c)$ Earmuffs	$(iii)$ High noise level
$(d)$ Landfills	$(iv)$ Solid wastes

What damage does vegetation cause?

Discuss the role of women and communities in the protection and conservation of forests.