This chapter explores the normative issues raised by the environment. It starts by defining the environment and explaining why the environment raises ethical questions. The chapter is then structured around four sets of questions. First, it considers why the environment has value and explores whether environmental degradation is unjust, and, if so, when. Many environmental problems are caused by one generation, but the consequences are felt by later generations. For this reason, the second set of questions concerns what responsibilities we have to future generations. The chapter then turns, third, to consider the ethical problems that are raised by policies designed to protect the environment. Finally, the chapter examines debates about what kind of political system is best equipped to deal with the challenges raised by environmental change. The case study focuses on climate change, examining some of the ethical issues surrounding dangerous climate change.