Where should we focus our effects to do the most good? Air Pollution, Armed Conflicts, Climate Change, Biodiversity, Education, Gender Inequality, Human Health, Malnutrition, Trade Barriers, Water and Sanitation. Bjorn Lomborg shows that some problems have a low return of investment in terms of human health and quality of life. Why do we waste so many resources on climate change when other issues will give us a much high return on investment. There are limited resources but unlimited desires. Questions answered at http://blog.ted.com/2013/11/12/me-help-me-bjorn-lomborg-i-didnt-understand-your-new-ted-talk-bjorn-sure-ama/