This report summarizes four country studies that were undertaken as part of the UNEP Country Case Studies on Climate Change Impacts and Adaptations Assessment. These studies, carried out in Antigua and Barbuda, Cameroon, Estonia, and Pakistan, were funded by the Global Environmental Facility and managed as a project of the UNEP Atmosphere Unit in Nairobi, Kenya. These country studies illustrate the importance of adopting a flexible approach to the assessment of climate change impacts and adaptations.