This study analyses trends and opportunities for trade among developing countries (i.e. South-South trade) in selected environmental goods, in order to assess the contribution such trade can make to a green economy transition. The term ‘developing countries’ includes all countries and territories listed as developing economies in the UNCTAD Handbook of Statistics (UNCTAD, 2012). The study focuses on South-South trade flows in several RE products and their components, including solar photovoltaic (PV) cells and modules, wind turbines, hydroelectric turbines, biomass feedstock, solar water heaters and solar lighting equipment, as well as other select environmental goods. The latter include water filtering and purification equipment and environmentally preferable products, such as organic agricultural goods.