The global community is crossing planetary boundaries while it has not yet met the basic needs of at least one-third of the global population. Although governance systems are developing, they are still unable to adequately deal with current global environmental problems. This article assesses global green governance, inferring that it is reactive, incoherent and fragmented, lacks the tools to implement a systemic approach, is ad hoc rather than principled, is becoming politically charged, and may be unable to support the implementation of a green economy and cope with the societal changes expected by 2050. The article concludes that fragmentation of international environmental law and policy is inevitable, but that some degree of constituti...