This paper provides an analysis of the international political dynamics around the reduction of tropical deforestation and forest degradation as a climate mitigation strategy, emphasizing the necessity of an enabling environment and sustainable financing to support the scaling up of these efforts globally. After describing the evolution from the 1990s of international cooperation to combat tropical deforestation, the paper focuses principally on the United Nations Framework Convention on Climate Change (UNFCCC), and how it provided an impetus for a renewed effort on this issue. The paper describes the complex process through which the climate and tropical forest agenda got inserted into UNFCCC processes, from its marginal role in the Clean Development Mechanism (CDM) created by the Kyoto Protocol to the emergence of REDD+ (Reducing Emissions from Deforestation and Forest Degradation and the Role of Conservation, Sustainable Management of Forests and Enhancement of Forest Carbon Stocks) as the forum where decisions have been made on climate and tropical forests. The paper dissects the issues that have dominated the REDD+ negotiations, identifies and characterizes the actors and constituencies that have been influential in the process, analyzes lessons learned from the successes of this UNFCCC agenda, and suggests recommendations to move the REDD+ and overall tropical forests and climate agenda forward. The paper concludes with an anticipation of what to expect in the future, in the light especially of what could possibly be a new climate change agreement in 2015.