This is a recorded webinar from August 1, 2023. The production of Portland cement emits carbon dioxide (CO2), which has been identified as a green-house-gas. Therefore, cement companies have been taking steps to reduce the CO2 output at their plants globally since the 1970’s, and more recently in the United States. One way to reduce CO2 emissions is by eliminating the production of ASTM C150 Type I, and replacing it with an ASTM C595 Type IL Portland Limestone Cement (PLC). This presentation will address the fundamental reasons for the change, and from a quality perspective, how a cement plant might go about managing the change. Additionally, the presentation will review concrete test data, compiled from varying cement plants and companies, with the intent of revealing why some may feel they have experienced issues with concrete compressive strengths, set times, and water demand, while others may report no significant changes to their concrete. Ultimately, all will better understand the technical merits regarding this transition, and how to work successfully into the future with PLC.