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Adaptation to climate change: so ambiguous. The paper consiçlers the meaning of the increasing importance given to adaptation to climate change. First it examines the theoretical challenge of the concept from the systems theory standpoint. Paradoxically this leads to focussing attention on the values and structural features specific of the system considered rather than on the features of its environment. This outcome justifies the introduction of a key distinction between those features and components touching the identity of the system and those that are purely instrumental. The status of adaptation is then scrutinized both in the discourse of economic experts and in international negotiations that aim to set up a new climate agreement. Beyond the need to take account of the inescapable part of climate change over the next thirty years, the paper shows how in the past the notion of adaptation has been mobilized to downsize the pressing need to take immediate vigorous mitigation policies. At present, its seems that the rise of adaptation is the sign and vector of an implicit abandonment of the goal of containing climate change within the 2°C increase range from pre-industrial levels. This meaning finds an appropriate vehicle in the economic mode of representation that considers mitigation and adaptation as two alternative means towards the same end, i.e. maximization of an intertemporal social utility function. Several objections are raised against the current assumptions made in that context. [ABSTRACT FROM AUTHOR]