The present edition is revised and considerably enlarged and contains 54 lectures on various facets of environment. These have been grouped under 10 broad areas ranging from an overview of the environmental problems, to environment as related to pollution, mining and metallurgy, renewable energy, biotechnology, tourism, forestry, education, law and conservation. The lectures were delivered before equally varied audiences, from scientists and technologists in professional academies/ societies, universities, institutes and colleges, to planners, decision makers, and managers of industrial establishments and public sector undertakings, lawyers and members of non-governmental organisations. The book contains perceptions of a well-known scientist from a developing country who is a first rate strategist for human survival: It is, therefore, an unique reference material on the state-of-art of Indian environment. The lectures are thought-provoking and in an eminently readable form.