British Petroleum was able to reduce its greenhouse gas emissions by 10% in just four years. For our presentation at OD Network 2012, Solvable built this case study on how BP used a combination of technology and culture change initiatives to meet this ambitious goal. This case study is drawn from research by Michael Goold, “Making Peer Groups Effective: Lessons from BP’s Experiences” in Long Range Planning Journal (2005); and David G. Victor and Joshua C. House, “BP’s Emissions Trading System” in Energy Policy (2006).