It is generally agreed that the difficulty in tracking of embedded carbon in the supply chain is one of the major obstacle for putting a price on carbon, and to mitigate for climate change. To help resolve this problem, it was recently discussed to apply block-chain technology to track the embedded carbon. In this project, we shall first do literature review on the subject, learn about block chain and life-cycle carbon audit, then select a product (or a line of products) and discuss conceptually if and how block chain can be used to track the embedded carbon of product through its production and distribution process.