Concept: Environmental laws in India were enacted in different years to deal with water pollution, wildlife protection, forest conservation and air pollution.
Step 1: Match The Air Act.
The Air (Prevention and Control of Pollution) Act was enacted in 1981.
\[
A \rightarrow III
\]
Step 2: Match The Forest Conservation Act.
The Forest Conservation Act was enacted in 1980.
\[
B \rightarrow II
\]
Step 3: Match The Water Act.
The Water (Prevention and Control of Pollution) Act was enacted in 1974.
\[
C \rightarrow I
\]
Step 4: Match Wild Life Protection Act.
The Wild Life Protection Act was enacted in 1972.
\[
D \rightarrow IV
\]
Therefore, the correct matching is:
\[
A-III,\ B-II,\ C-I,\ D-IV
\]