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This paper undertakes a Generalized Input-Output analysis on the Swiss economy in order to identify key sectors in greenhouse gases (GHG) emissions. The analysis reveals the actual relevant sectors by taking into account indirect emissions. In order to refine results on key sectors, a sectoral calculation of GHG embodied in Swiss trade is undertaken. Results reveal that some sectors such as food products, machinery rentals and basic metals play an unexpected role in GHG emissions.