This chapter focuses on the complexity of environmental problems, which is one of its defining characteristics in the sense that there are often many interconnected, variable elements to the problem. It considers the interaction between values and environmental law, which involves some reflection on differing attitudes to the environment. The chapter examines some of the ways in which these values are translated into environmental principles, such as the goal of sustainable development or the Precautionary Principle; it then goes on to consider the question of whether these principles have legal status in the sense that they create legally enforceable rights and duties. Finally, it considers broader questions of environmental justice and the role of different types of rights in environmental protection.