Where was the attempt to treat wastewater by combining artificial and natural processes carried out?

Consider the following statements:
$(a)$. $40\%$ of the forest has been lost in the tropics.
$(b)$. $JFM$ was introduced in $1965$ by the $UNCED$.
$(c)$. The Bishnoi community belongs to Odisha and played a major role in the conservation of forests.
$(d)$. The Chipko movement started in the Garhwal Himalayas.

Identify the correct pair.

The $UN$ Conference of Parties on climate change in the year $2012$ was held at

Soil conservation can be best achieved by having

$A$ plastic sack manufacturer in Bangalore found an ideal solution to the ever-increasing problem of plastic waste. Identify this person.