This report presents project and activity summaries from the fourth international Conference on Community-Based Adaptation (CBA) to Climate Change held in Dar es Salaam, Tanzania in 2010. It notes that CBA is targeted at those most vulnerable to climate change and represents a relatively new approach consisting of community-based development activities, practices, research and policies. It is community driven and has flourished throughout many vulnerable communities in developing countries and also some developed countries.The paper covers a variety of subject areas, such as management of water resources, agriculture, ecosystems and cross cutting issues of policy, funding and strengthening institutions. On strengthening institutions the paper gives summaries on governance, institutionalisation, advocacy of community-based adaptation, networking among civil society organisations and the strengths and weaknesses of using voluntary grassroot structures in disaster management. On management of water resources, the paper gives summaries and case studies on Integrating community-based adaptation in water projects, vulnerability and adaptation, assessing effectiveness of community-based adaptation interventions and developing early warning ground water monitoring systems.The report also presents summaries on the role of insurance and microfinance on community-based adaptation of farmers, policy linkages for community-based adaptation and agricultural practice and management, community-based adaptation for drylands and pastoralism, community-based adaptation in urban areas, and managing and communicating knowledge about good community-based adaptation. It also presents summaries and case studies on vulnerable groups, the role of ecosystems in adaptation mainstreaming community-based adaptation within disaster risk reduction and community-based adaptation methodologies.