Governments must integrate the management of climate change risks into wider policy making if they are to successfully adapt to them. Economic analysis has a vital role to play in supporting these efforts, by identifying costs and benefits and supporting decision-making for an uncertain future. Building on the experience of OECD countries, this report sets out: - the latest economic evidence on costs and benefits of adaptation, - options for governments to finance adaptation, - and tools to mainstream adaptation into decision-making processes.