Despite an increasing global awareness of environmental concerns, setting internationally binding and ambitious commitments has proven exceedingly complex. As states are seeking alternative methods to support global environmental protection, this book takes a closer look at the possibility of using national trade measures that make market access conditional on the environmental impact of the production process abroad. Inspired by accepted practice in other fields of law, Barbara Cooreman illustrates that the extraterritorial character of these environmental trade measures is not necessarily inconsistent with WTO law by proposing an extraterritoriality decision tree for trade measures targeting foreign production processes. Identifying key challenges through varied case studies, the author demonstrates that states can indeed use their market to further environmental progress, when the state's environment is affected and where a minimum level of international legal support exists for the environmental concern at issue. The book shows that current WTO laws leave more room for action than often thought and concludes that WTO law is no excuse for environmental inaction. Practical and comparative, this book will appeal to scholars of both environmental and trade law. It also offers a valuable tool to aid judges and lawmakers alike in determining the lawfulness of a measure.