This session will introduce the role (and opportunity) that Open Source and Distributed Ledger Technology have to play in measuring GhG emissions across our supply chains to decarbonize global production infrastructure. It will share challenges of tracking supply chain scope 3 emissions data, including the current state in which reporting is siloed, estimation based, and with low-to-no transparency of data provenance. It will explore how regulatory and market signals including gov. regulation, consumer demand, capital markets, and green finance indicate an increasing impact on corporate profitability and how this is creating new demands for trusted, transparent, and dynamic emissions reporting with granularity to the product level. The session will explore how Open Source Distributed Ledger Technology can deliver an interoperable layer of emissions data to enable market and regulatory forces to act in unison to decarbonize supply chains at a more rapid rate. It will conclude with an introduction to the mission of the Hyperledger Climate Action and Accounting Special Interest Group (CA2SIG), the tools under development (net emissions token network, secure identifier solutions, and emissions data channels) and opportunities to get involved in this Open Source community.