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. While the UNEP Handbook on Methods served as a common reference for the study teams, each team found it necessary to adapt these methods - sometimes to a considerable extent - to meet the specific needs of the country. Moreover, two of the country studies (Estonia and Pakistan) were able to build on previous work on climate impacts, while the other two (Antigua and Barbuda and Cameroon) broke new ground. The studies provide a basic foundation for understanding the potential impacts of climate change and the adaptation measures necessary to address them. They indicate the scope of the problems in each of the countries studied, as well as the direction adaptation studies should take. Most importantly, they demonstrate that while each country has a unique set of problems and strategies, all countries will benefit from long-term sustainable development.