This paper propose an innovative simulation model based on web technologies devoted to analyze environmental impact of the whole supply chain. The authors developed a whole framework for collecting data from different users including good producers, logistics operators and retailers by a web questionnaire; this service is automatically integrated with a simulator that evaluate the green aspects of each case by self generating a model for this specific case and providing synthetic results; in addition the green log model developed allows to create interactively very complex supply chain. The paper propose the general architecture of the green log model and an example for supporting its validation and verification.