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Brazil's Chief of Staff Dilma Rousseff (C, background) delivers a speech next to a 100% ethanol powered aircraft made by Brazilian jet manufacturer Embraer, in Sao Paulo, Brazil. 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.(AFP/Mauricio Lima)AFP - 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.