Copied below is a good article in Reason Online concerning the results of the 2008 Copenhagen Conference. The purpose of the conference was to bring together the world's leading economists to concentrate the attention of policymakers, charitable foundations, and members of the public on the relative urgency and costs of the world's big problems. You might be surprised by the number one solution - suppplying Vitamin A and zinc children who lack them in the developing world. The price tag is $60 million a year but the cost is dwarfed it by the benefits - stronger immune systems, less sickness and death, and improved cognitive development. Read their proposed solutions and then vote whether you agree or disagree with their findings.