Originally published in 1973, this book has enduring relevance in the 21^st Century. Asking difficult questions it encourages the reader to think about the individual and societal changes which are needed to protect the planet and the health and prosperity of future generations. Despite the title of the book, it covers air, water and land pollution, evolution, the industrial revolution, the growth of technology, climatology and meteorology, pollution legislation and the economics of a green economy.