According to Greenhouse Gas Protocol (GHG), scope 3 emission includes all the indirect activities that occurs in company’s supply chain (logistic, business travels, purchased goods and services etc.). The scope 3 emission are also usually larger than the scope 1 (direct) and scope 2 (purchased energy) emission for many companies that are in the international trade businesses. At the moment, there are no clear guidelines for SMEs on how to determine and calculate their scope 3 emission.