Identify the person who defined pollution as 'The presence at large of substances or energy patterns which have been involuntarily produced, have outlived their purpose, have escaped by accident, or have unforeseen effects, in quantities which harm his (man's) health or do offended him'.

1750+ questions from past NET Geography papers.

UGC NET or NTA-UGC-NET, is the examination for determining the eligibility for the post of assistant professor and/or Junior Research Fellowship award in Indian universities and colleges.