This edition examines the politics of the Earth through reference to discourses based on the argument that language matters, that the way we construct, interpret, discuss, and analyze environmental problems has all kinds of consequences. The goal is to elucidate the basic structure of the discourses that have dominated recent environmental politics, and to present their history, conflicts, and transformations. The text discusses four basic environmental discourses: environmental problem solving, limits and survival, sustainability, and green radicalism. This introduction provides an overview of the changing terms of environmental politics, questions to ask about discourses, the differences that discourses make, and the uses of discourse analysis.