In 2010, over 50 researchers, planners, economists, architects, sociologists, health professionals, and hydrologists, as well as several other professionals and experts of other fields relevant to the study of climate variability and change met and agreed to contribute to assess potential effects and impacts associated to climate variability and change in Puerto Rico. The main objective of the initial group was to assess the vulnerability of coastal communities, critical infrastructure, and biodiversity and to initiate the development of adaptation strategies. However, it was necessary to broaden the scope of work as new members from other sectors and disciplines joined the group. This group of volunteers adopted the name Puerto Rico Climate Change Council. The Council’s work was conducted under four sub-groups: (1) Geophysical and Chemical Scientific Knowledge; (2) Ecology and Biodiversity; (3) Economy and Society; and (4) Communicating Climate Change and Coastal Hazards. At the time of publishing this report, the Council has 157 members and collaborating partners.