Rethinking World Problems | The Kojo Nnamdi Show

If you had an extra $50 million to spend on the world's problems, where would you spend it -- to stop global warming, fight the spread of HIV/AIDS, combat malnutrition or something else? A few years back, Danish business professor Bjorn Lomborg created a firestorm of controversy when he suggested that efforts to combat global warming don't always return the biggest bang for our collective buck. He joins Kojo to explain.