Where was the $UN$ Climate Change Conference held in $2012$?

For plastic waste,ragpickers used to get $P$ rupees per kilogram. Now,because of Ahmed Khan,they have started receiving $Q$ rupees per kilogram.

What is the main idea behind the "Joint Forest Management Concept" introduced by the Government of India?

In India,petroleum is found in:

Which of the following are correctly matched?
$I.$ Arsenic poisoning $-$ Black foot disease
$II.$ Secondary effluent treatment $-$ Biological process
$III.$ Pyrolysis $-$ Solid soil waste disposal
$IV.$ Tubifex $-$ Water pollution indicator
$V.$ Biomagnification $-$ Degradable pollutants

Which is the main causative factor of desertification?