The Amazon rainforest, the world's largest and most biodiverse, represents a global public good of which 15 percent has already been lost. The worldwide value of preserving the remaining forest is today unknown. A"Delphi"exercise was conducted involving more than 200 environmental valuation...

While economic growth in developing countries over the last ten years has lifted more people out of poverty than in any previous time, more than one billion people still live in countries affected by violent conflict. Conflict weakens governance, undermines economic development and threatens...