The Top Ten Solutions to the World's Biggest Problems: The final dispatch from the 2008 Copenhagen Consensus Conference: "Where in the world can we do the most good? Supplying the micronutrients vitamin A and zinc to 80 percent of the 140 million children who lack them in developing countries is ranked as the highest priority by the expert panel at the Copenhagen Consensus 2008 Conference. The cost is $60 million per year, yielding benefits in health and cognitive development of over $1 billion."
policy makers take special note here: "at the BOTTOM of the list? At number 30, the lowest priority is a proposal to mitigate man-made global warming by cutting the emissions of greenhouse gases, and the whole One Laptop Per Child thing doesn't even make the list."