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For a number of years, Reducing greenhouse gas Emissions from Deforestation and forest Degradation (REDD) has been the subject of debates and proposals within the framework of international negotiations for the treaty that will succeed the Kyoto protocol. This paper reviews knowledge on this emerging initiative which has a double objective : integrate tropical forests in the struggle against climate change and ensure that developing countries take part in international efforts for the reduction of greenhouse gas emissions. Considering the differences between proposals formulated by States and the difï¬culties of quantifying deforestation and forest degradation really avoided, the paper reveals problems for the implementation of this initiative, which has a strong commercial connotation in the current context of ï¬nancial and economic crisis.