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One aspect of the use of biomass for energy purposes that is still controversial concerns their full environmental sustainability. Considering the crucial importance of this problem, numerous authors have carried out evaluations of the environmental impact of the various types of biomass by means of several approaches. Although some of these methods are excellent environmental evaluation tools they are unfortunately unable to manage uncertain input data. Fuzzy-set based methods instead have proved to be able to deal with uncertainty in environmental topics. The innovative contributions proposed by fuzzy logic relate, on the one hand, to the representation of vague, imprecise and uncertain information, and on the other, to handling such information using fuzzy rules and tools. A fuzzy inference system (FIS) constitutes the practice of formulating mapping from the input to an output using fuzzy logic. In this paper a syntetic index based on a fuzzy expert system is proposed to assess the sustainability of production and use of crops dedicated for energy purposes.