Brazil's Chief of Staff Dilma Rousseff a

Brazil's Chief of Staff Dilma Rousseff attends the opening of the five-day International Conference on Biofuels, in Sao Paulo, Brazil, on November 17, 2008. An international conference on biofuels involving officials from 40 countries got underway in Brazil on Monday with delegates to consider the issues of development, food security, trade and climate change. The conference, started with three days of technical discussions before ministers take over for the final two days. Brazil is the biggest exporter of ethanol, which it makes from sugarcane, and the second-biggest producer, after the United States. AFP PHOTO/Mauricio LIMA (Photo credit should read MAURICIO LIMA/AFP via Getty Images)