Exploring a safe operating approach to weighting in life cycle impact assessment - a case study of organic, conventional and integrated farming systems

► A new approach towards weighting in life cycle assessment is proposed. ► The safe planetary boundaries are used as a base for the weighting factors. ► The weighting factors are applied to a case study comparing various farming systems. ► An integrated farming system had the lowest total environmental impact score. ► Biodiversity category had the highest impact on the uncertainty of the results.