Which of the following is a non-renewable resource?

The salinity of the oceans is

Which of the following is a non-renewable resource?

$A$ : Montreal Protocol suggested the reduction of $ODS$.
$R$ : $A$ landmark international agreement taken in Earth summit held at Rio de Janeiro.

The raw material for making polyblend is

At the beginning of the $20^{th}$ century,forests covered about $.....P.....$ of the land in India. By the end of the century,this had shrunk to $.....Q.....$.