REDD is a phenomenon. Arguably, no other aspect of the climate regime established under the United Nations Framework Convention on Climate Change (UNFCCC) is characterized by the intersection of as many and as varied international and national legal instruments. Neither has any other climate aspect attracted the attention of the legal community working with questions of regime interaction and interplay, consistency and/or fragmentation of international law and polycentricity to the extent REDD has. Complexity is inherent in the very idea of REDD . Conceived as an incentive mechanism under the UNFCCC for developing countries to adopt and scale up climate mitigation actions in the forest sector, it mirrors in its design the pluralistic interests – and tradeoffs – that characterize that sector. Perhaps more than any other sector, the forest sector amplifies multiple objectives, ranging from resource exploitation, land management, agriculture and food and fuel production, ecosystem services, biodiversity protection to providing people with livelihoods, amenities and sanctuaries. This book provides a thorough analyses of the interplay between the REDD framework under the UNFCCC and other international regimes from the perspective of interplay and interaction.