Eco-global criminology, as noted in Chapter 1 , is one of several perspectives that fall under the broader rubric of green criminology. This chapter outlines the core concerns of eco-global criminology as these relate to concepts of harm, the globalization of harm, global political economy and the increasingly transnational nature of environmental crimes and harms. It closes with a discussion of eco-global criminology’s adoption of horizon-scanning as a useful tool for examining over-the-horizon issues and trends that are likely to generate environmental crimes and harms now and into the future.