Economist Bjorn Lomborg makes a persuasive case for prioritizing the world's biggest problems, asking "If we had $50 billion to spend over the next four years to do good in the world, where should we spend it?" His recommendations - based on the findings of the 2004 Copenhagen Consensus - controversially place global warming at the bottom of the list (and AIDS prevention at the top). Lomborg was named one of the 100 Most Influential People by Time magazine after the publication of his controversial book, The Skeptical Environmentalist which challenged widely-held beliefs that the environment is getting worse. Now the Danish economist is taking on the world's biggest problems with his Copenhagen Consensus.