In recent years, we have seen an enormous increase and rising interest in academic research using field experimental methods to address questions across a broad range of topics in environmental economics including individual climate protection, the management of energy or water consumption, traffic management, and resource conservation. At the same time, field partners from policymaking and business start to appreciate the benefits that field experiments can have to design and evaluate policy programs and investigate individual behavior. This seminar is designed to provide an overview of the design and the analysis of field experiments in environmental economics. In the first part of the course, we will focus on methodological issues surrounding the design of field experiments and subsequent interpretation of the results. In the second part of the course, students will present and discuss selected examples where field experiments have been used to (i) test predictions of theoretical models and/or enhance our understanding of the factors that drive individual behavior and to (ii) evaluate whether and why policy interventions work.