When is it morally acceptable to expose others to risk? Most moral philosophers have had very little to say in answer to that question, but here is a moral philosopher who puts it at the centre of his investigations. Sven Ove Hansson shows why traditional moral theories are ill suited to deal with risk and uncertainty, and proposes new approaches that can do so much better. The book contains many examples that connect moral philosophy to the practical world of risk management in new ways. This is an important book for moral philosophers as it opens up a new area for ethical investigations. It is equally important for risk analysts and policy makers who need input from moral philosophy in order to deal with the difficult normative issues that arise in decision-making under risk and uncertainty.