What the Stern Report did in 2006 for climate mitigation and the need to reduce carbon emissions, former UN Secretary General Ban Ki-moon now tries to do for climate adaptation: Show the numbers! This week, the Global Commission on Adaptation that Ban Ki-moon founded together with Bill Gates and Kristalina Georgieva of the World Bank, published its Adapt Now report, stating that investing $1.8 trillion in climate adaptation now will lead to a total of up to up to $7.1 trillion in net benefits. The message is clear, investing in climate adaptation to better cope with extreme weather and rising sea levels makes economic sense. But why are we not doing it then?