The Chicago Climate Action Plan (CCAP), Chicago's roadmap for reducing climate change impacts and adapting to the changes already occurring, relied on rigorous analysis to formulate policy decisions through stakeholder coordination and public engagement. Three key pieces of analysis contributed to Chicago's adaptation strategy: an evaluation of Chicago's higher and lower greenhouse gas emissions scenarios; an assessment of Chicago's economic risk under both emissions scenarios; and a prioritization of potential impacts using a scoring system that included likelihood of occurrence and local consequences of occurrence.
Potential adaptation tactics were categorized according to their expected benefits and costs and led to the creation of working groups to develop action plans that will include primary actors, timelines, budgets, and performance measures that the City will monitor. While not essential for all cities, the impacts analysis was of high value to the adaptation strategy. However, a strategy for stakeholder engagement is crucial in ensuring that the implications of climate impacts are properly understood.