Preface When you write a book like this after ten years' working as an environmental specialist, you end up with something that reflects your career. Of course, when I started working at the Ministry of the Environment in the Netherlands, I could not foresee that I would now be at TNO, nor that I would have performed research into chlorine, PVC, waste, etc., that would come to form the basis for this book. But step by step, with some coincidence and with the support of several people - who were probably unaware of the crucial role that, with hindsight, they played - I arrived at a position...