The UNEP Copenhagen Climate Centre ‘Perspectives Series' is a series of publications aimed at sharing expert and practitioner opinions and experiences on emerging topics related to climate change. This new volume addresses a key question for adaptation policy and practice: ‘How can we measure, aggregate and compare climate change adaptation needs and results across activities, countries and sectors?’ The volume collects together eleven articles from international experts and practitioners, each offering their own unique insights and perspectives on this main thematic question.