Environment: for Civil Services Prelims & Main and Other competitive examinations About the Author Prof. D R Khullar holds a Masters degree from Punjab University, Chandigarh and retired as a Principal, Government Post Graduate College, Kalka (Haryana) in 1998 after serving in different colleges of Haryana and Punjab. He has authored more than 40 books on different aspects of Geography and allied subjects. His knowledge on the subject has received an unprecedented response world over.Mr. J.A.C.S. Rao holds a Masters degree in Biochemistry from Andhra University, Waltair, Andhra Pradesh. Later he completed M.A. Sociology from G.G.U., a central university in Bilaspur. He joined Indian Forest Services (I.F.S.) in 1987 and was allotted Chhattisgarh Cadre and has held several posts in the Forest Department. Since Mr. Rao has worked widely in the field of Agriculture, Horticulture, Animal Husbandry, Fisheries etc. he has written several articles, books and booklets on the same. He also has a wide teaching experience in various institutions.