Textbook of Environmental Studies About the Author Dr. Deeksha Dave is currently an Assistant Professor, Environmental Studies, School of Agriculture, Indira Gandhi National Open University, New Delhi.&nbsp She did her Ph.D. in Ethno-botany and Ecology from University College of Science, M.L. Sukhadia University, Udaipur. She has contributed several papers to conferences and journals of national and international repute. Her areas of research include pollution control, biodiversity, alternate sources of energy and management of global environmental issues. Professor S.S. Katewa is currently Head of the Department of Botany, University College of Science, M.L. Sukhadia University, Udaipur. A Fellow of the Society of Ethno-botanists, he has been teaching ecology to undergraduate and postgraduate students for over 25 years. He has been associated with several projects funded by the UGC, the Ministry of Environmental and Forests and several other government agencies. He has to his credit over 70 research papers in national and international journals.