Taking the Rational Approach

The Opinion Journal sits down for a talk with Bjorn Lumborg to discuss rationalism and its application to world problems:

In 2004, he invited eight of the world's top economists--including four Nobel Laureates--to Copenhagen, where they were asked to evaluate the world's problems, think of the costs and efficiencies attached to solving each, and then produce a prioritized list of those most deserving of money. The well-publicized results (and let it be said here that Mr. Lomborg is no slouch when it comes to promoting himself and his work) were stunning. While the economists were from varying political stripes, they largely agreed. The numbers were just so compelling: $1 spent preventing HIV/AIDS would result in about $40 of social benefits, so the economists put it at the top of the list (followed by malnutrition, free trade and malaria). In contrast, $1 spent to abate global warming would result in only about two cents to 25 cents worth of good; so that project dropped to the bottom.

His 'Copenhagen Consensus' can be found here. More from the Journal:

His organization, the Copenhagen Consensus Center, held a new version of the exercise in Georgetown. In attendance were eight U.N. ambassadors, including John Bolton. (China and India signed on, though no Europeans.) They were presented with global projects, the merits of each of which were passionately argued by experts in those fields. Then they were asked: If you had an extra $50 billion, how would you prioritize your spending?

And the results of that survey? Click here.