The work is aimed to propose an approach toward the evaluation of environmental impacts enhancing sustainability and the process of environmental assessment in an optic of sustainable development. A set of environmental aspects applicable to a firm activity to define the overall environmental impact are selected and processed through a fuzzy approach aimed to reduce subjective judgments. The procedure is based on a vectorial graph allowing to organize data and define a structured data analysis. An action research conducted in a genetic research center is conducted to evaluate the effectiveness of the proposed approach.