In early 2008, global warming advocates came together to begin the process of developing an overarching narrative, or Common Message Platform, to identify the shared ideas, values and explanations that provide the foundation for a national conversation on global warming over the long term. The framing guide that has been developed is informed by several sources, including the experiences of the environmental and climate communities, the thinking of strategic advisors, and a body of research conducted in recent years, as well as new research conducted specifically for this project.